View Full Version : Any ideas as to why most Dothans are capped to ~2.6Ghz?
HKPolice
12-05-2005, 04:38 AM
I've got a 740 that is limited to 2.64Ghz, no matter what voltage I push through it. The FSB is limited to around 220Mhz as well, no matter what multiplier or vAGP I use. Clockgen doesn't help.
Seems like too much of a coincidence to me, that MOST chips are limited to around the 2.6Ghz area.
My chip is an OEM from a Dell Inspiron 9300, I have a feeling that Retail chips are less likely to be 'locked'?
Running on droop modded P4C800-E 1024 beta and Zalman 7000Cu.
Any ideas?
Vitality
12-05-2005, 05:12 AM
No theyre not "locked". I had two 740:s, wich first did go with stock voltages little over 2700MHz and 1.6v over 2900MHz. Second dit at least around 2700MHz with stock, didn't try any further.
Did u try to put multiplier like 10 and after that go up with clockgen? Sounds strainge anyhow... Try that FSB400 setting with jumpers on adapter. Might help too.
marc2003
12-05-2005, 05:12 AM
got my retail 740 sat here nicely @210x13=2730. it needs 1.55v and i'm using the stock ct479 cooler. my p4c800e dlx is unmodded. :)
it'll boot at 2.8 but isn't stable.... :p:
like you say, more people seem to have more joy with retail as opposed to oem chips.
leejsmith
12-05-2005, 06:00 AM
my dothans.
first m730 boxed cpu would do 2800
current m730 after motherboard/ct-479/cpu blew does 2675
i just bought at m750 hoping to go higher but that stops at 2605 think this was a laptop pull
these below are oem but new chips not used before
m750 that did 2800 but would not go past 240fsb with any multi
also a m760 that also did 2800+
saaya
12-05-2005, 06:45 AM
its just a yield thing...
nothing magic about it
fordf250
12-05-2005, 03:19 PM
My 740 would boot at 28000mhz with 1.6V and stock cooler and was stable at 2750, my 760 will boot at 2903 and 1.6V.
My 740 would boot at 28000mhz with 1.6V and stock cooler
holy sh** :D
But seriously my 750 is stable @2.7 but there sure are 730/740/750 that are at least 2.8Ghz benchable.
Also setting jumper to 400fsb helps
saaya
12-05-2005, 04:21 PM
sounds about right... the 20 780es chips i had all did from 2.9 to 3.2ghz on air benchable, but those were handpicked :D
2.7 to 2.9 seems to be the average oc for the latest steppings i think.
leejsmith
12-05-2005, 11:43 PM
i just tested a new m780 last night on air but the p4c i used droops bad.
with vcore at 1.5 lowest recorded vcore 1.45 it was very happy at 2.7
with vcore at 1.6 and lowest of 1.52 it would do 2.93 stable but anything higher caused super pi errors under load due to the droop problems.
sure this would do over 3ghz on air with a good mobo and no droop.
mrlobber
12-05-2005, 11:55 PM
sounds about right... the 20 780es chips i had all did from 2.9 to 3.2ghz on air benchable, but those were handpicked :D
:slobber: You sure have none of them left, have you? :D
My 740 is benchable up to 2800mhz on air, but I'm using it at 2600 Mhz all day on passive cooling (TT Sonic Tower :) )
RoyaL
12-06-2005, 02:30 AM
sounds about right... the 20 780es chips i had
f*****g sh|t man,this is krazey!! :eek:
and you don't have one dothan for your rig :stick:
anyway i had 5 770,3 of them couldn't go over 27xx no matter what and the other 2 babies done 29xx
rite now i have a 780ES 3ghz daily use :D
oh, h2o cooling
saaya
12-06-2005, 02:33 AM
i just tested a new m780 last night on air but the p4c i used droops bad.
with vcore at 1.5 lowest recorded vcore 1.45 it was very happy at 2.7
with vcore at 1.6 and lowest of 1.52 it would do 2.93 stable but anything higher caused super pi errors under load due to the droop problems.
sure this would do over 3ghz on air with a good mobo and no droop.
wow, thats a nice chip! :D
wwwww
12-06-2005, 02:43 AM
well my 533FSB dothans:
740 Retail to 2.55Ghz
750 Retail to 2.75GHz
got a 730 OEM but no mobo atm :P - waiting on a P4GD1...btw Saaya you posted the P4GD1s to Aus yet (getting babyelf's when he's finished playing with it :P)? Getting eager :P
Well I got a PM database here:
http://www.wwwwwoc.net/db.htm
Doesn't appear to be much difference in the average clocks of the OEMs and the Retail chips. The averages of each are 2640Mhz and 2633MHz for Retail and OEM respectively. Seems that some just randomly cap alot lower. My OEM went further than my retail...
but got another OEM 730 here with a lapped spreader just waiting to be o/ced :P
ooooo this new edit is cool :P
hipro5
12-06-2005, 03:14 AM
Yes.....As a matter of fact they ALL can do a lot better than that BUT the ASUS CT-439 adapter will not let them to do so.....;)
http://www.xtremesystems.org/forums/showthread.php?t=82191
wwwww
12-06-2005, 03:47 AM
Yes.....As a matter of fact they ALL can do a lot better than that BUT the ASUS CT-439 adapter will not let them to do so.....;)
http://www.xtremesystems.org/forums/showthread.php?t=82191
All I can say is, wow, you're freakin' 1337. Now, how much is it going to cost me to have you mod an adaptor for me (with teh ultimate mod :P)? :P
hipro5
12-06-2005, 04:35 AM
All I can say is, wow, you're freakin' 1337. Now, how much is it going to cost me to have you mod an adaptor for me (with teh ultimate mod :P)? :P
Find a person near you in Australia that can solder SMDs and do the mods for you, coz we live far-far away so as to send it to me and send it back.... :)
EDIT: What's the 1337?.....:D
leejsmith
12-06-2005, 04:44 AM
shame it's going into a customers laptop to spend it's life strolling along at stock speeds when it's secretly wanting to be in my single stage rig.
i would not pay another £200 for this chip to gain 0.2ghz over the m760.
wow, thats a nice chip! :D
wwwww
12-06-2005, 05:13 AM
Find a person near you in Australia that can solder SMDs and do the mods for you, coz we live far-far away so as to send it to me and send it back.... :)
EDIT: What's the 1337?.....:D
oh
elite
turned to
leet
l33t
1337
:P
My adaptor's mildly screwed atm anyway :(, so what you reckon the total costs would be to get an adaptor in your country, mod it, then shipping to Aus? Under US$100?
hm, the 2 dothans i have (1x 755, 1x 760) are both capable of 2.8ghz at 1.6v,
so i'd say it is rather more a yield thing than anything else. same as with any
processor or chip or whatnot really. even some of the magical jiuhb's (xp1700's)
didn't go too high, crapping at 2.2-2.3 ghz on air, while others did upwards of
2.5 ghz - nothing to worry about, really.
the only thing worth looking into there might be the production weeks, to see,
if maybe certain production-weeks are better than other (probably older ones).
anything else is just crystal ball stuff really
wwwww
12-06-2005, 06:48 AM
Oh if it's the adaptor...
on the DFI 855GME, my 745 made 2.66GHz (166*16) while my 715 wouldn't go past 158FSB = 2370MHz, but would do that at 1.196V (sitting in my laptop atm @ 1.08V 1.5Ghz - ty Eist.exe :P).
hmm...it's 1:47am here, forgot the point I was trying to make. g'nite all those in Aus...:P
the old ones (7x5) were limited on the fsb, so you had to use all the multis
available to get them to fly or anywhere near useable. this is no longer the
case with the (7x0) default fsb 133 parts.
hipro5
12-06-2005, 12:52 PM
oh
elite
turned to
leet
l33t
1337
:P
My adaptor's mildly screwed atm anyway :(, so what you reckon the total costs would be to get an adaptor in your country, mod it, then shipping to Aus? Under US$100?
Ahhhh......I see......:D
I do not know how much does the shipping from Grece to Australia costs...
hipro5
12-06-2005, 01:23 PM
even without the jumper (533/400)
Jumper at 533 fsb with the mods...;)
wwwww
12-06-2005, 02:49 PM
even without the jumper (533/400)
What kind of difference does the jumper make? All the jumper pins of mine...errr...fell off...worth getting some conductive paint for it?
lawrywild
12-06-2005, 03:26 PM
400fsb usually helps boot higher and gives a slightly higher oc (did for me and many others)
hipro5 try 400fsb jumpers with mods, maybe 285 boot :slobber:
snatchmonkey
12-06-2005, 05:00 PM
From my own tests I'd have said they average more like 2750+Mhz on the stock cooler. Out of the five sonoma's I tried I got three that would do 2800 on air ( a 730, 750 and a 760 with 250+ max fsb) , and two that wouldn't (bout 2675 and 2750 with 240 and 245 max fsb respectively - both 730's).
I think you just got a bit unlucky with your chip HKPolice :(
Da_maniaC
11-10-2006, 08:58 AM
Sorry to kick such an old topic but i am having some problems here with my PM760.
I tried booting with it on 201 FSB with 1,45 Vcore.
But i wont get a BIOS post.
Now i read ppl talking about using the 400 MHz FSB setting on the CT479 converter board..
but is it even possible to make the PM760 post on stock speed while the FSB jumpers are on 400 instead of 533?
Da_maniaC
11-12-2006, 07:13 AM
Anyone?