Small bit of OCing, left me quite confused by the results

[Scratch]

Hey all,

First post so go easy on me. Long time tech head/tweaker, but not a huge amount of OCing practice.

Gonna keep this short:

• DELL Box, Locked Bios
• Software OCing CPU
• All OCs are tested and stable
• GPU overclocks fine (5770 PMd1G)
• This is just a hold-over to a new rig

When I overclock the GPU, I see a performance boost. Fine. When I overclock the CPU I see a performance boost in some tests, and a take a hit in others? Wut?

ARMA2: Up
CSS: Down
CoH: No change
Stalker: Down
Heaven: Down

PCMark7 scored higher on stock than OC'd?

Crysis I need to retest.



Then I tested the CPU on its own.

It takes hit on the max stable overclock, but still benches higher than stock there.

If some games/benches just saw no benefit, that'd be fine, but them doing worse, that makes no sense?

This is based on a thread here, but its a bit long winded: http://www.boards.ie/vbulletin/showthread.php?p=81194687#post81194687


Any wise input welcome!
Thanks,
Scratch.

 

[Perturabo]

I cant say I know why but I have noticed the same thing in Heaven myself. At 4.8 on the CPU I get a lower speed than at stock. Although at 4.2 its better than stock...I was wondering if it was a stability related thing but the OC seems stable in prime etc. Would also be interested to know what is happening here!

 

[Scratch]

I'm wondering if it could be a power issue.

 

[Rastalovich]

Something some reviewers and testers generally don't do is:

a) wait anything up to 5/10 minutes (depending on your setup) for windows to boot and settle down properly. 1 to 5 % of cpu will be taken up by caching, search indexing, blah blah

b) make sure no other crap is running at same time as your bench. Anything. This includes opening Taskmanager and being sure the idle process is on a constant 99%. Classic is sppsvc.exe, it's not always there, but can rear it's ugly head several minutes after you've booted. Both takes up cpu %age and can cause the gpu to go 50-100-50-100 % at the same time. Anytime it's there right-click on it and close it. Be warned tho, it doesn't stay away.