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3.8 vs 4ghz 955BE? - Page 2

post #11 of 17
Quote:
Originally Posted by dixson01974;13468123 
EDIT
I have a friend that had a XIGMATEK Dark Knight and he which to a NH-D14. He needed .5v less voltage for 4.0ghz on his 1055T.

wink.gif

To elaborate further,
Xiggy DK loaded me at 58-60C (socket temp) and I required 1.475V for 4Ghz.
The NH-D14 improved me to 45C (socket temp) and I was able to lower to 1.425V @ 4Ghz. The new cooler's significant temp reduction allowed me to use less voltage. This theory works in the same way when you are using water cooling or DICE. Since you are able to keep the CPU cooler you can use less voltage; on DICE you could smash 4Ghz stable with significantly less voltage than air cooling. Having better cooling seems to push back further the wall where you will need a significantly higher voltage for a small jump in clock speed, on AMD Phenom II CPUs.
Quote:
I got 4GHz on stock voltage. HAHAHAHA! Heck, I get 4.2GHz at 1.4125v even.
Water cooling & low temps probably helps a lot smile.gif
post #12 of 17
Yes! A whole lot!
 
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post #13 of 17
Quote:
Originally Posted by BWG;13468000 
Some chips can easily hit 4.0 and some can't. It is the nature of the beast. You could try to put heatsinks on your MOSFETS to see if it helps any.

EDIT: 60C is getting a little up there for this chip. I run at 48C @ 4.4 under load.

This. Heard of 'golden' chips? They, for some reason (usually simply a better line of chips) OC better than others. Luck!
Quote:
Originally Posted by timma100;13467954 
So, iv been messing around with my 955BE for the last two weeks. I can hit 3.8ghz on stock volts and be rock solid with max temps at 45C ish. But 4ghz takes 1.525 and temps are pushing 60C. So what gives? is that 200mhz the most serious megahertz in history lol

I hit 4.01GHz at stock voltages*, rock solid and temps around 41, 42c (45c load). Not bad in 37-38c ambient smile.gif

However, to get to 4.2 my voltages need to get to 1.56-1.57 and over a 10c jump in temps. Not worth it!
Quote:
Originally Posted by full_force1986;13469638 
Is it a c3 or c2? If c2 you will most likely struggle to hit 4.0

C2 CPUs are much more difficult to hit high frequencies than the C3s. The main difference is that the C3s require 125w whereas the C2s need 140w. A big difference!



*with a 965, but the idea's the same!
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post #14 of 17
sometimes you just hit the chips limit. for instance my 955 @4.2 runs at 1.425v but 4.5 takes 1.65v.


edit:
Quote:
Originally Posted by xd_1771;13470225 
wink.gif

To elaborate further,
Xiggy DK loaded me at 58-60C (socket temp) and I required 1.475V for 4Ghz.
The NH-D14 improved me to 45C (socket temp) and I was able to lower to 1.425V @ 4Ghz. The new cooler's significant temp reduction allowed me to use less voltage. This theory works in the same way when you are using water cooling or DICE. Since you are able to keep the CPU cooler you can use less voltage; on DICE you could smash 4Ghz stable with significantly less voltage than air cooling. Having better cooling seems to push back further the wall where you will need a significantly higher voltage for a small jump in clock speed, on AMD Phenom II CPUs.


Water cooling & low temps probably helps a lot smile.gif

I always wondered if there was a correlation between Voltage & Temps.
Edited by (mirror)52-D.S.L. - 5/11/11 at 4:42pm
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post #15 of 17
hi all. just want to share mine though im using 965 (which is pretty similar to 955 anyway)

before i was stable at 3.8ghz @ 1.32v and cpu-nb at 2000mhz @ stock volts. ran IBT for 20 passes maximum level and it passed.

next i tried 4ghz @ 1.375v and cpu-nb at 2000mhz @ stock volts still. sometimes i pass sometimes i dont. weird. may more voltage.

but when i just tried to add more cpu-nb speed, from 2000mhz to 2400mhz @ stock volts still, i could run it to 3.8ghz @ 1.28v ... weird
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post #16 of 17
3.0 NB may slow it down anyway. 2.6 Or 2.8 is optimal.

Sent from my SGH-i917 using Board Express
 
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post #17 of 17
3 nb wouldn't slow it down unless slow ram is used(which then becomes the next bottleneck).
i have benched with my slow ass ram and messing with different cpu/cpu-nb/ram settings right up to 4038 cpu-nb,above 37xx cpu-nb i begun to notice deterioration in scores(i am using generic ddr2 800 that wont clock higher than 902mhz or go tighter than 5-5-5-15).It looks as though all who posted here have DDR3 in excess of 1333 so increasing cpu-nb should still reap benefits.
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