View Full Version : Two e6600's Week 29 vs. week 44
seedomo
04-01-2007, 05:35 AM
Very interesting results as I try to get to 4GHz.
Cooling = Swiftec MCW6500 TEC 226 watt TEC
MB = EVGA 680i
Pelt PSU 300watt Meanwell at 13.8 Volts
Strange results in temps:
Week 44 chip @ 3.7 GHz:
Needs 1.6 Volts for stablity. temps 8-35 (idle/load)Celcius Using Orthos Small FFTs
Week 29 chip @ 3.7 GHz
Needs 1.45 Volts for stablity. temps 9-41 (idle/load)Celcius Using Orthos Small FFTs
Sooooo... why are the temps the same? If the needed voltage is less on the Week 29 chip, shouldn't the temps be lower as well? Can the amperage be different on the two chips? Amps*Voltage=Watts
One more thing is that the Week 29 won't even post any higher than 3.75 MHz even at 1.685 VCore but will run stable at 3.50 using only 1.5 volts!
Gam3Ra
04-01-2007, 06:07 AM
There is something strange, many peoples think lower voltage C2D's temperatures are lower, but not!
I've read in other forums testers have found that too!
cadaveca
04-01-2007, 06:23 AM
lower voltage cpu's draw more current. this is evident by vdroop. This is also why they clock better...more current available means the cpu can go farther.
look at it this way...65w @ 1.2625 or 65w @ 1.325. IF W = V x A, then it's quite obvious what's going on here.
I think SMD's on bottom of cpu are different, and this is what makes the difference.
seedomo
04-01-2007, 06:34 AM
This is also why they clock better...more current available means the cpu can go farther.
Do you mean that there will be more voltage available in bios when the starting point is 1.2 vs 1.3 for equivalent GHz?
IF W = V x A, then it's quite obvious what's going on here.
Amps are different, right?
seedomo
04-01-2007, 06:46 AM
Any suggestions on how to get to 4GHz, must I head over to the phase forum and start reading up?
cadaveca
04-01-2007, 06:50 AM
Votlage is not current. Voltage=the 1.325, amperage is the current provided with that 1.325v. It seems as though the "b" chips require more current for some reason...probably didn't meet "a" requirements.
Coolaler's "super b" was an "A" chip given the "b" treatment so it could scale as high as it did. this "b" treatment changes the vdroop by providing more current to the cpu.
Read Intel's vdroop documents, 4 or 5 times...maybe 6...lol...abnd it will all be clear :lol2:
vdroop mod might be in order...and maybe now you understand why it's done.
BTW, did ya need to insulate w/ that block?
fhpchris
04-01-2007, 09:50 AM
Yes, the B chips do use more current at the same voltage and run hotter as a result. A nice B chip such as a L628B Xeon 3060 will run prime @ 1.35v and 3600 mhz ;)
Gam3Ra
04-01-2007, 10:05 AM
Is this only with C2D or all CPU's? There is P4/A64 good steppings that overclocks with less voltage than others?
seedomo
04-01-2007, 10:26 AM
BTW, did ya need to insulate w/ that block?
Yes, I did insulate with the included neoprene. Also with conformal coating.
cadaveca
04-01-2007, 10:37 AM
Is this only with C2D or all CPU's? There is P4/A64 good steppings that overclocks with less voltage than others?
Dunno. Probably tho. Most likely why each series of cpu has a specific week that clocks signifgantly higher than any other.
this is why cpu's are so differnt in the first place...not only is the max frequency different, the current required the "push" the gates varies as well. understanding how this works is what makes certian people get consistenly higher overclcoks than others do, IMHO. Upping the volts isn't always the answer to better overclocks.
STaRGaZeR
04-01-2007, 10:43 AM
Yes, the B chips do use more current at the same voltage and run hotter as a result. A nice B chip such as a L628B Xeon 3060 will run prime @ 1.35v and 3600 mhz ;)
Or 3700 1,38v :D
http://img111.imageshack.us/img111/1778/orthosas7.th.jpg (http://img111.imageshack.us/my.php?image=orthosas7.jpg)
theelectic
04-01-2007, 11:04 AM
Sooooo... why are the temps the same? If the needed voltage is less on the Week 29 chip, shouldn't the temps be lower as well? Can the amperage be different on the two chips? Amps*Voltage=Watts
Because not all the power put into a CPU is lost as heat. It's not a light bulb. That's why some CPUs run hotter than others.
couppi
04-01-2007, 02:05 PM
lower voltage cpu's draw more current. this is evident by vdroop. This is also why they clock better...more current available means the cpu can go farther.
look at it this way...65w @ 1.2625 or 65w @ 1.325. IF W = V x A, then it's quite obvious what's going on here.
I think SMD's on bottom of cpu are different, and this is what makes the difference.
From what I understand, due to variations in the process, silicon, etc., some chips have slightly "leakier" transistors than others. These leaky transistors let more electricity escape as heat energy. For reasons I don't know, leaky transistors can run faster than less leaky transistors, but they use more current and need less voltage for the same speed.
I could be talking out of my ass though.
MarlboroMan
04-01-2007, 02:35 PM
are both CPU lapped??
'cause we all know, temps can be really affected by a concave IHS. I think week 29 is more concave than week 44.
Or 3700 1,38v :D
Looks familiar :D Mine is 28B and used arctic freezer hsf.
http://img.photobucket.com/albums/v636/loc_oc/Orthos37001.jpg
STaRGaZeR
04-01-2007, 04:13 PM
Looks familiar :D Mine is 28B and used arctic freezer hsf.
Yeah mine is also a 28B, damn nice chips we have :D
cadaveca
04-01-2007, 06:10 PM
From what I understand, due to variations in the process, silicon, etc., some chips have slightly "leakier" transistors than others. These leaky transistors let more electricity escape as heat energy. For reasons I don't know, leaky transistors can run faster than less leaky transistors, but they use more current and need less voltage for the same speed.
I could be talking out of my ass though.
Higher leakage=most used current.:fact: Personally, I don't think you are so far off there. The leakage allows the gate to handle greater current, but in turn, it takes more current to push them. As I said earlier, Vdroop holds alot of answers, IMHO.
Lestat
04-01-2007, 07:08 PM
things WILL vary from board to board also so take that into consideration also.
1 chip will not do the same thing on 2 different boards.
im still on my 6600 ES B1 S5 (QPGE i think) and have yet to only see 2-3 cpus that are NOT ES chips do what mine does.
heck even other ES chips are hard to find that do what mine does.
(i'll be askin a premium for this girl if i ever let her go)