Avoid 6600 - Batch 7638A742 [Archive]

The Asgard

03-19-2007, 06:11 AM

Just a word to the wise for people that have access to chips based on batch codes. Avoid 7638A742 like the plague. Worst C2D chips I have ever come across. Failing Orthos with 1.45 on the core at 2.7G's and will not boot at 400FSB with any amount of voltage.

eva2000

03-19-2007, 06:17 AM

similar but a bit better is Jammer's Xeon 3060 with 7638A563 with 3.4ghz at 1.42v http://i4memory.com/showthread.php?t=3771

The Viper

03-19-2007, 06:20 AM

Holy Crap thats terrible

dinos22

03-19-2007, 06:21 AM

considering those other clocks i've seen from the OP i can certainly say there is no user error with those clocks................oh boy lucky i didn't jump blindly on the whole Xeon bandwagon :eek:

alpha0ne

03-19-2007, 06:38 AM

considering those other clocks i've seen from the OP i can certainly say there is no user error with those clocks................oh boy lucky i didn't jump blindly on the whole Xeon bandwagon :eek:

It crossed my mind more than once to 'give em ago' when Jammer was waiting for his Xeon :slapass: :nono:

irev210

03-19-2007, 07:51 AM

also avoid L631A

does better though, hits 3GHz, still crap though.

itznfb

03-19-2007, 07:54 AM

agreed. i had several 28A's, all sucked. highest was 3.3ghz stable. highest benchable was 3.76ghz. my 29F's are even worse =\

Yoxxy

03-19-2007, 08:01 AM

26a, 32a Ftw.

The Asgard

03-19-2007, 08:59 AM

Currently using a 629B. I have had access to a fair few 6600's (100+) and always check them to see how they clock. The current trend seems to be that the newer chips are getting worse for overclocking ability. Just thought I would give you the heads up.

Maybe Intel are getting wise

eva2000

03-19-2007, 09:04 AM

bench261

03-19-2007, 09:37 AM

also avoid L631A

does better though, hits 3GHz, still crap though.

i have an l631a, i haven't really tested it at all cuz the temps get really high fast at stock cooling just browsing online at 3.8ghz. not stable stress testing at 3.6ghz. i cant get any higher as it seems im limited to 420-425 fsb. its either the cpu or mobo. once i get watercooling ill find out

nn_step

03-19-2007, 09:42 AM

sounds like they are remaking the Layout for higher yields.

Ten

03-19-2007, 10:04 AM

hmm i have an E6600 7638A739 runs stabel 3,6 @ 1.52v. And it runs quite cool to ~50 @ orthos small fft. I must be lucky then:)

Knight

03-19-2007, 10:10 AM

sounds like they are remaking the Layout for higher yields.

Can you explain that? :(

agenda2005

03-19-2007, 10:16 AM

My 2 cent is that you should also avoid anything with F. The one I have keep failing Orthos at 3.24GHZ no matter what kind of Vcore voltage set.

nn_step

03-19-2007, 10:29 AM

Can you explain that? :(

they care about Profit but not Overclockers.

rithina

03-19-2007, 10:33 AM

My 30F is the best.. out of 4 6600 i used...26A, 32B, 33F, 29A..
1.5v DMM measured to run at 3.6mhz prime stable

Tibu

03-19-2007, 10:34 AM

they care about Profit but not Overclockers.

That is the point of any private enterprise/company.

kiwi

03-19-2007, 10:38 AM

Might be, however 7638A742 is fine, 3.6 1.5V stable and 3.9 1.65V benchable on air.

F are not bad either, I had L628F 6300, hit 3.4GHz stable and L638F 6300 which hit 3.6Ghz stable at ~1.5V

Bs are the best, the only problem they heat up more

nn_step

03-19-2007, 10:39 AM

That is the point of any private enterprise/company.

absolutely remember winchestor?
They used to be great then CBBID came out and it sucked

ChaosMinionX

03-19-2007, 11:13 AM

My Xeon in my sig will run 3.6ghz on 1.4250 to make it stable in orthos, will boot 1.375 though.

Patriote

03-19-2007, 11:38 AM

J@mmer

03-19-2007, 01:43 PM

Yep agreed guys! It seems the Xeon's made in the Philipines suck! Mine however is still ORTHOS stable at around 3400 to 3480 but yes they are terrible clockers compared to other Xeons out there.

http://img150.imageshack.us/img150/2752/orthos3400142lo5.th.png (http://img150.imageshack.us/my.php?image=orthos3400142lo5.png)

barrymaldon

03-19-2007, 01:49 PM

I've got a 28a and it'll boot into windows at the max fsb my board will do 9*455 on water

iviustang50h

03-19-2007, 02:49 PM

My L640A820 overclocks like crap as well. I wish I would have know that they are getting worse as time went on. It's too late to RMA it now. :(

JoeBar

03-19-2007, 03:39 PM

I'm a bit relieved seeing this thread. I got a crappy L636A 6300 for my 2nd rig and this thing tops @ 2.9ghz and this with 1.6v. :p:
FSB isn't an issue cause it can go up to 470mhz with 6X multi.

I'm too busy right now to change it, but its lifespan is till April's price drops... ;)

sreedx2

03-19-2007, 10:00 PM

:( sounds like my :shoot: L638F050

kromosto

03-20-2007, 12:04 AM

also avoid L631A

does better though, hits 3GHz, still crap though.

i dont agree with this either. my l631a run 3.15 ghz with only 1.28 volt and 3.6 with 1.4 volt also can reach 3.9 with 1.5 volt and i am just with stock cooler.

Nmbr1Ballr

03-20-2007, 12:37 AM

I have an L631 that I run @ 3.6ghz w/ 1.5325v 24/7.

Postal Dude

03-20-2007, 05:39 AM

Im yet to test my L630F 6400. Lookin at this thread is a littlw worrying. Hope it can do at least 3.2.

fhpchris

03-20-2007, 10:16 AM

itznfb;2078053']agreed. i had several 28A's, all sucked. highest was 3.3ghz stable. highest benchable was 3.76ghz. my 29F's are even worse =\

My E6600 @ L628A did 3710 Orthos on water?

You guys seem to have no clue what you are doing ;)

The Xeons are still better than the non-xeons though :)

NaeKuh

03-20-2007, 01:27 PM

Hey Guys,

sorry to spam the thread but there is a good friend that have that 6600 L631b120 and i'd like to know if it's a good clocker.

What can i expect from that chip ?

PS: It'll be hooked under watercooling.

Thanks a lot!

EDIT: Did a few research and found out that these chips Oc pretty well and it's lapped :D

did this friend of yours get the CPU at frys? :D

I picked up the same stepping this weekend. L631B120, OEM from frys.

She's does 3.53 at 1.375V , if you want anything higher, you need to jump to 1.45V for 3.612 stable, and at 1.58V max was around 3.85. However i can pull off a superPI 1m and play with it for 30 more min b4 she hangs and freezes. I think if i dropped more voltage, she could probably hang at 3.85, but the idle temps at 1.58 was near 35C on H2O :X

Those of you wondering, they have about 8-9 more. The manager at frys was nice enough to pull his stock and allow me to flat test the CPU. A few of them are really bad on the IHS. This is why the manager pulled them for me. I showed him how to flat test with letters, and he was in disbelief, at how unflat the ihs was.

This frys is located in Burbank in CA. Incase your wondering which frys it is. Price was 309.00 :\

itznfb

03-20-2007, 01:56 PM

My E6600 @ L628A did 3710 Orthos on water?

You guys seem to have no clue what you are doing ;)

lol yea right :p:
the 28A's and the 29F are the only ones i've had trouble with. i had a 26A that did 3.8ghz and a 28B that did close to 3.9ghz, and a 6300-27A that did 3.7ghz, all on air all stable. but those 28A's and 29F seem to be stuck around 3.4-3.5 at best. real disappointments. kind of like fhpchris's post :p:

cuke2u

03-20-2007, 02:04 PM

Hi, I've just got a E6600, and it is a L636A646, is this good or bad?
ChrisC

mouawad

03-20-2007, 03:21 PM

My E6600 @ L628A did 3710 Orthos on water?

You guys seem to have no clue what you are doing ;)

The Xeons are still better than the non-xeons though :)

you got a couple of decent clocking chips, don't delude yourself that you have special o/c talents.

clocking intels is a piece of cake, the chip can either do it or it can't.

btw my 27B E6600 does 3.75 orthos stable with 1.4v (droop to 1.34 on evga 680i)...better than the avg Xeon result i've seen posted here.

MADMAX22

03-20-2007, 03:27 PM

my 6600 28A does 3.9 stable with 1.52 (1.50/1.49 load), not the best but i cant complain

Sem

03-20-2007, 03:47 PM

my E6600 does 5.6Ghz at 0.77v :rolleyes:

J@mmer

03-20-2007, 06:38 PM

Tried to squeeze a bit more out of this CPU. This is the best I could get it (give or take a few mhz):

http://img161.imageshack.us/img161/7177/orthos3455151vrq9.th.png (http://img161.imageshack.us/my.php?image=orthos3455151vrq9.png)

clon22

03-20-2007, 07:40 PM

you got a couple of decent clocking chips, don't delude yourself that you have special o/c talents.

clocking intels is a piece of cake, the chip can either do it or it can't.

btw my 27B E6600 does 3.75 orthos stable with 1.4v (droop to 1.34 on evga 680i)...better than the avg Xeon result i've seen posted here.
Sometimes, i feel its a bit of luck...
I tried a few 6600 L630F020 in my shop...
1pc can do orthos @ 3.8ghz, but fsb capped @ 505mhz
1Pc only do 3.5ghz stable but fsb up to 550mhz...
1pc, 3.3ghz also no go... :)

Postal Dude

03-20-2007, 11:49 PM

Clon22:
Thanks for that post. Iv just got myself a L630F 6400. 3.2Ghz would be fine for me. upgrading from opty 146 @2.8. 400Mhz over that should be a very nice increase in speed :D

OBR

03-20-2007, 11:54 PM

every newest batches 63xA of E6600 are bad overclockers ...

Omastar

03-21-2007, 12:12 AM

My Xeon 3060 L630A986 (pack date: 11/15/06) does 3.6GHz, 1.375v Orthos stable, 3.73GHz at 1.4v, 3.8GHz at 1.425v, and 3.9GHz at 1.5v. I run it at 3.6GHz for 24/7. Still runs hot, but apparently not as hot at B chips.

I think Gautam confirmed this stepping was a good one, as well.

fhpchris

03-21-2007, 12:45 AM

you got a couple of decent clocking chips, don't delude yourself that you have special o/c talents.

btw my 27B E6600 does 3.75 orthos stable with 1.4v (droop to 1.34 on evga 680i)...better than the avg Xeon result i've seen posted here.

I think I have had what now?

L624A E66
S6 E67 ES
L628A E66
L629A Xeon
L631A X68
L628B Xeon
L628B Xeon #2

The worst one was the 24A, and it primed 3650 or so, followed by the 28A, and each xeon has done 3.9ghz prime and the X6800 only did 3.8 prime, but it ran 3d over 4100...

I guess all my chips are not half bad... for all Retail CPUS (E67 ES and X6800 were untested used.)

clocking intels is a piece of cake, the chip can either do it or it can't.
This just isnt true, once you have a board that can do good fsb(~450+ on 9x) and give stable voltages, you run into the problem of cooling (small temperature changes help alot..L629A Xeon got 80+ mhz prime from temps) along with a nice mount, and then finally you have to deal with your system memmory and dividers...

That isn't easy.

Some chips like my X6800 do hit that hard wall, they prime 3810 or so, but 3830 just is a clear NO GO even with more voltage and better cooling by a huge ammount, but others like my L629A Xeon will just keep going and going...

Poodle

03-21-2007, 02:47 AM

This just isnt true, once you have a board that can do good fsb(~450+ on 9x) and give stable voltages, you run into the problem of cooling (small temperature changes help alot..L629A Xeon got 80+ mhz prime from temps) along with a nice mount, and then finally you have to deal with your system memmory and dividers...

That isn't easy.

I hear ya. Unlike everyone else I actually prefer clocking with AMD. The HTT multi though scary for a noob takes only primary school mathematics to handle and everything else is even easier.
With this Intel rigg I have to think about alot of stuff concerning the NB that you don't have to with AMD like strap and stuff. But it's the best overclocker I've had both on low and high Volts. I love my 6600. :)

mouawad

03-21-2007, 02:48 AM

Take your pick, there's now heaps of boards that will do 4ghz on it's ear with a 6600/9x multi.

You're right in that you do have to tame the temps somewhat but clocking on the 680i board for instance is the easiest o/c ever, i was priming @ 3.6 stock volts on everything within the first 30mins of using Intel since northwood days.

it's the same as it's always been, the chip still has to be upto the task :) a pack date of a few weeks later and most likely i'd need .1v more for the same results.

mouawad

03-21-2007, 02:50 AM

I hear ya. Unlike everyone else I actually prefer clocking with AMD. The HTT multi though scary for a noob takes only primary school mathematics to handle and everything else is even easier.
With this Intel rigg I have to think about alot of stuff concerning the NB that you don't have to with AMD like strap and stuff. But it's the best overclocker I've had both on low and high Volts. I love my 6600. :)

have a drive on a 680/650 board, it's childs play to hit 430+FSB stock volts.

965/975 = more tweaking & possible cooling involved

paulesko

03-21-2007, 06:04 AM

mi xeon 3060 737A makes 3440 with 1.37v not very good but it´s not bad either

fhpchris

03-21-2007, 11:47 AM

have a drive on a 680/650 board, it's childs play to hit 430+FSB stock volts.

965/975 = more tweaking & possible cooling involved

You cannot say that here, it would be so easy for a good clocker to read that and go buy a Abit FP-IN9 and struggle for even 375 fsb.

There are good boards and bad ones, and the people who have less experience usually have the problem of having the bad ones...

J@mmer

03-21-2007, 01:36 PM

mi xeon 3060 737A makes 3440 with 1.37v not very good but it´s not bad either

Sounds similar to mine. Once you go past 1.4V it takes a crapload of volts to get any higher.

G4h4o8s6T

03-21-2007, 01:43 PM

every newest batches 63xA of E6600 are bad overclockers ...My friend recently got a E6600 L637A from the egg, that does 3.6ghz 1.48v(1.525v BIOS)..............so I guess not ALL of them are bad clockers, but it seems most of them are.

goodcooper

03-27-2007, 12:33 PM

???

i got the 7638a563 3060, and i had it running 3.6ghz and it seemed stable...

3.2 24/7 stock volts...

i guess i should break out the orthos and check my numbers

paulesko

03-28-2007, 01:08 AM

Sounds similar to mine. Once you go past 1.4V it takes a crapload of volts to get any higher.

that´s it, I need aroun 1.55-1.6 to get it stable at 3600 or so

J@mmer

03-28-2007, 05:57 PM

At least you can get 3.6 stable! I can't get it ORTHOS stable at all, no matter how much vCORE, vFSB or vMCH I give it. :(

No matter, this CPU will go into my server/folding box and I'll get another CPU for my main rig.

BvK

03-29-2007, 10:26 AM

"B" are better to overclock than "A" isn't it? The only good cpu's I have seen with an "A" were the L625A, L630A and 1 L637A. Good "B" cpu's were L628B till L632B. I have had an L625A (3.6GHz 1.42V prime), an L628B's (3.6GHz 1.4V) and I am testing another L628B..does 3.2GHz with 1.168V..still testing :D

EMan

03-31-2007, 01:40 AM

probably better chips moving to E6700 model :)

Are you being serious? (I couldn't tell)

If true, the April 22 price cuts would seem to make the E6700 the chip to get (multi aside). Isn't the E6700 expected to drop ~37% (to $316), whereas the E6600 is only expected to drop ~27% (to $183).

IluvIntel

03-31-2007, 04:16 AM

my E6600 does 5.6Ghz at 0.77v :rolleyes:

What? can you prove this?

J@mmer

04-01-2007, 04:49 PM

He's just bull crapping Rodney.

slim142

04-05-2007, 07:31 PM

My L628A wont be stable at 400mhz not even with 1.60v

Max I got it stable was 333mhz LOL! Tried 350mhz FSB and nothing, orthos fails, not even with 1.40v.
I dont know if my RAM is holding me back, but Im pretty sure is my CPU the one that sucks.

911us

04-05-2007, 08:20 PM

My friend recently got a E6600 L637A from the egg, that does 3.6ghz 1.48v(1.525v BIOS)..............so I guess not ALL of them are bad clockers, but it seems most of them are.

my 6600 week 37A does 3600Mhz stable at 1.44v but >3600Mhz,it eats voltages like hell,require 1.6v for 3700mhz stable.