5970 slower when overclocked

[Born_2_Kill_83]

With my new shiney 5970 I get 23516 in vantage.
When I overclock and overvolt to 1.162v 900/1275 I get 23300.
Any ideas why this is, I only also get one more FPS in Unigine DX11 4xAA 16xAF.

Also why have a dropped from 25150 with my old GTX 295 to the above score with my 5970, physx?

 

[ejr22]

I would have thought the answer is obvious - the GTX295 is better.

*runs*

 

[layte]

Yea, PhysX on NV cards distorts the result. As for the slower scores when OC'ing, I guess some kind of thermal/VRM regulation is going on.

 

[Tomliboo]

+1

 

[Didaco]

ii reckon you should run some actual game benchmarks as after all that is what the card is for
crysis naturally comes first

 

[blackninja]

With my new shiney 5970 I get 23516 in vantage.
When I overclock and overvolt to 1.162v 900/1275 I get 23300.
Any ideas why this is, I only also get one more FPS in Unigine DX11 4xAA 16xAF.

Also why have a dropped from 25150 with my old GTX 295 to the above score with my 5970, physx?

PhysX is the answer to what the GTX 295 has a higher score ..

Crysis Very High @ 1920x1080, 8XAA is a nice test methinks You can actually play the game at that res! Also, try the stalker call of pripyat bench ...

 

[BigBruiserAl]

5*** cards throttle rather then crash if you o/c and you scores drop is pretty good chance its not fully stable....give her more vcore

 

[Geckovich]

5*** cards throttle rather then crash if you o/c and you scores drop is pretty good chance its not fully stable....give her more vcore

This. If the memory is pushed too far it self corrects itself, actually causing a performance drop despite it appearing like it should be running faster.

To correctly oc the 5 series you need to up the memory in stages benching between each, stopping when performance drops. I'm not sure about the core, I think that's just normal oc procedure.

 

[wakayoda]

That's the worst price to performance ration I have ever seen, my whole pc cost less then that GPU and I get more then 10000 in vantage

 

[Born_2_Kill_83]

Strange I re-ran the tests and pulled 23743 @ 900/1250 (this seems to be a sweet spot), so not sure what happened the first time with the lower score. However this is still only 200 points more with a massive overclock, do you think its the standard res holding me back of vantage?

I'm RMAing my monitor at the moment so I can go any higher, hopefully in terms of games and Unigine it will make a bigger difference @ 1920*1200?

 

[Born_2_Kill_83]

That's the worst price to performance ration I have ever seen, my whole pc cost less then that GPU and I get more then 10000 in vantage

15000 vantage points while only a benchmark will relate to quite a lot in terms of performance in games/FPS etc can you run Crysis 4XAA and 16XAF @ 1920*1200 60+FPS? - No you wont even get half that my friend.

 

[GJ02]

are we talking overall score or gpu score here ?

 

[chief barker]

Why overclock the card? it's fast enough at stock, I certainly won't be overclocking mine even though it's the voltage tweak edn.

 

[DavyBoy]

Why overclock the card? it's fast enough at stock, I certainly won't be overclocking mine even though it's the voltage tweak edn.

Maybe because he enjoys overclocking things like the majority of the folk here do....

 

[chief barker]

Maybe because he enjoys overclocking things like the majority of the folk here do....

Sorry

 

[kitfit1]

With my new shiney 5970 I get 23516 in vantage.
When I overclock and overvolt to 1.162v 900/1275 I get 23300.
Any ideas why this is, I only also get one more FPS in Unigine DX11 4xAA 16xAF.

There are a number of reasons, the first being Vcore. The second being the relationship between core speed and ram speed.

To be running the core at 900/1000, you will need Vcore set to at least 1.25v.

Ram speed needs to be set about 100mhz ahead of core speed for optimal performance. But also, under stock cooling anything above 1200 will result in a degredation in performance, unless the core speed is above 1000.
This is down to the heat generated by the VRM's and the fact that increasing the ram voltage is not an option unless you have ATI overvolt tool installed.