Lower performance in games after overclocking CPU??

[lolman]

This is a weird problem: I get lower FPS after overclocking my CPU than not overclocked.

My setup:

E6420
P5B Deluxe Wifi/AP
4GB G.Skill DDR2-800 5-5-5-15
XFX 8800GTS 512MB

Basically at FSB 340 * 8 = 2720MHz my superpi result is 19.4 seconds
At FSB 380 * 8 = 3040MHz my superpi result is 17.2 seconds

Hence my CPU definitely does improve it's performance.

However I ran rthdribl, at 640x480 @ FSB 340*8 I get almost 240FPS
at 640x480 @ FSB 380*8 I get 120FPS

I get a lot of fps drop in games as well.

Does anyone know what the problem could be?
Thanks in advance

 

[sutahz]

I dont know how to explain it exactly, but back when I had a XP-M 2800+ overclocked, along w/ a X800GTO overclocked, i found the max OC i could achieve on both and when running 3DMark06 I got lower scores w/ both maxed out then at an inbetween point (I dont rem, like 80% of what my max was..?).
I think whats happening is overhead. You push it so hard that in real world applications the overhead takes more away then you are adding. You don't see it in synthetic benchmarks because they handle the information differently (they have lower then avg overhead?). Just a thought.

 

[lolman]

hmmm but do you think it could affect the performance that much?

e.g. In the same area in WoW, at 2.7GHz I get 53FPS, at 3.04 GHz I get 19FPS

Thats like my FPS halved after OCed by an extra 300MHz

 

[sutahz]

It is what it is, you have a fact in front of you.
Also you may not have a stable overclock so the calculations it's messing up on could greatly hinder your FPS.

 

[rogue1979]

Maybe the higher fsb utilizes a different memory divider (slower overall memory speed) that slows down applications that depends on memory bandwidth?

 

[Comdrpopnfresh]

try bumping voltage a bit. Have you aggressively tightened memory timings? If so, try backing off, and if you're backed off, try to get a bit more aggressive.

 

[lolman]

hmm.. I'm running 1:1 (at fsb 380 my mem is 380, DDR2 760), do you see anything wrong? Also are there any bios options I have missed that could cause this to happen?

 

[smaky]

is you video card running at 16x not 1x , i read somewhere it goes to 1x after overclocking for some people

 

[lolman]

wow that could be... how do you check and why does it go to 1x after overclocking anyway? Can you give me a link to thread/more info?

 

[lolman]

nevermind, I just checked in CPU-Z, yes you're right my Link Width once at FSB 380 becomes 1x, at FSB 340 link Width was at 16x, what a weird problem, how does one exactly fix this problem?

 

[smaky]

the fix was easy I will look for the thread I found it in, however since this harddrive been formated last night, I will have to do some searching

edit:

here is the link

http://www.tomshardware.com/fo...erclocking-help-figure

Symptoms :
PCI-E Link Width switches from 16x to 1x after a restart.

Solution :
- Unplug PSU, wait a few seconds, replug PSU.
- Unplug PSU, reset CMOS, replug PSU, renter all BIOS settings, save, shutdown, power on.
- Combining slightly lowering or uping voltages of PCI-E, Vmch, VCore and FSB can usually fix it. Also try
disabling ASUS C.G.I and PEG Force 1x., and changing values to PEG Link Mode.

 

[lolman]

thankyou very much, I was just on that thread too, I tried the unplugging and pci-e to 101 it didnt work but I manually set the NB and SB voltages and walla back up to 16x.
I'm surprised Asus has not released a new bios that fixes this dreadful problems. Anyway thanks for the help everyone in this thread.