Core vs Memory Overclock

[LtMatt]

See dont ask dont get - thanks for taking the time, seems to me (atleast for sleeping dogs) that the extra bump in mem. clock caused about a 10% increase in fps across the board ( 10% for average and max with 11% bump in min. fps) seems worth wile

Amen.

 

[Doco]

So I decided to do the same run as I got quite curious about the performance gain myself - 1200 core with 1200 stock and 1425 o/c memory @ 2560x1440 -

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Spoiler

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Spoiler

Gain may as well not be worth it - maybe if I was able to clock the memory higher (such as your 1800mhz)

 

[LtMatt]

What core clock and what memory clocks did you use? Things to remember 7970 has more SP's, Compute units etc and as clocks increase that will make more difference.

 

[Doco]

What core clock and what memory clocks did you use? Things to remember 7970 has more SP's, Compute units etc and as clocks increase that will make more difference.

the core and mem. clocks are ther just before the spoiler tag lol

Looking back over the numbers you were able to boost your memory clock by 500mhz, whereas I was only able to increase it by 225mhz, as as you stated the 7970 has more compute units that allows o/c's to to make a larger difference

 

[LtMatt]

7970 has 296 extra stream processors, 16 extra texture units and 4 extra compute units, plus the fact i added more mhz to my memory overclock. You didn't add much to your clock so i doubt you would see as much gain. The extra pixel fill rate of the 7970 probably helps more as well as this is the main bottleneck of tahiti.

 

[Doco]

True - glad you added your tests - if I happened to post my results it would appear that memory o/c makes little difference, atleast you can show people that if you can hit even the average clocks on a 7970 you can expect a 10% boost ( could also use these 2 to show some of the differences in the 70/50 )

 

[Uncle Petey]

Fwiw, my 7950 would only go up to 1450 on the memory.
My current 7970 does 1900 around 1.606-1.625v. Haven't really tried going past that as I'm not really a benchmark kinda guy.

Nice to know it's there though

 

[Rusty0611]

True - glad you added your tests - if I happened to post my results it would appear that memory o/c makes little difference, atleast you can show people that if you can hit even the average clocks on a 7970 you can expect a 10% boost ( could also use these 2 to show some of the differences in the 70/50 )

Already been done my friend.

http://forums.overclockers.co.uk/showthread.php?t=18503005

7970 memory goes a bit further on most occasions but it's game dependent as to whether that has any effect on performance or not. Obviously silicon lottery dependant as to whether you get a naff clocker or not.

 

[LtMatt]

True - glad you added your tests - if I happened to post my results it would appear that memory o/c makes little difference, atleast you can show people that if you can hit even the average clocks on a 7970 you can expect a 10% boost ( could also use these 2 to show some of the differences in the 70/50 )

No problem. Its always interesting to see how much difference it can make.

Fwiw, my 7950 would only go up to 1450 on the memory.
My current 7970 does 1900 around 1.606-1.625v. Haven't really tried going past that as I'm not really a benchmark kinda guy.

Nice to know it's there though

Good info Pete, wish my memory clocked as well as yours.

 

[Uncle Petey]

Wished my core clocked as well as yours

Thing is, I may have only got 1150/1450 on that card, but there are plenty of other 7950's (some of them the same model as the one I had) that went plenty higher.
7970 memory does generally seem to go higher from what I've seen though.

 

[LtMatt]

Wished my core clocked as well as yours

Thing is, I may have only got 1150/1450 on that card, but there are plenty of other 7950's (some of them the same model as the one I had) that went plenty higher.
7970 memory does generally seem to go higher from what I've seen though.

I'll trade you some of my core speed and high asic voltage heat for some memory speed. Deal?

Yeah that's because its a lower rated Hynix memory speed wise and voltage wise.

 

[Rusty0611]

The MSI TFIII V2 OCs were monstrous clockers. Shame the cooler didn't work .