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post #701 of 1506
Quote:
Originally Posted by Martyr82 View Post

I've tested this in both Auto-select mode and dedicated to 9800 mode and in both situations, my physics score is poor compared to not having the 9800 plugged in at all.
Am I doing something wrong or is this card just too old compared to my i5-2500k / GTX 670 setup?

What do you mean exactly by "my physics score is poor compared to not having the 9800 plugged in at all."

It's totally possible that using the 670 alone for rendering + physX would be faster in terms of FPS than using the 670 for rendering only and offloading physX to the 9800. The 670 is a much more powerful card, and if the particular situation at hand is not so difficult, rendering-wise, then it would have a lot of extra power to devote to physX. Basically, the tougher the rendering scenario, the more likely it becomes that having the dedicated 9800 for physX would help rather than hinder.

IOW at all low settings at 1280x1024, the 9800 for physX would likely slow down perf cause the 670 has so little to do, but at 5760x1080 with all settings maxed and AA on and such, the 9800 would help because the resources of the 670 is tapped out doing the rendering. Plus the FPS would be much lower, making it less likely that the 9800 would have trouble keeping up with physX processing.

Bottom-line a 9800gtx is the absolute bare-minimum I'd consider using with a 670 ... a more appropriate card would probably be something more like a 550ti or 460. Or just using the 670.
Edited by brettjv - 5/11/12 at 8:30am
    
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post #702 of 1506
Quote:
Originally Posted by brettjv View Post

What do you mean exactly by "my physics score is poor compared to not having the 9800 plugged in at all."
It's *possible* that using the 670 alone for rendering + physX would be slightly faster in terms of FPS than using the 670 for rendering only and offloading physX to the 9800. The 670 is a much more powerful card, and if the particular situation at hand is not so difficult, rendering-wise, then it would have a lot of extra power to devote to physX. Basically, the tougher the rendering scenario, the more likely it becomes that having the dedicated 9800 for physX would help rather than hinder.
IOW at all low settings at 1280x1024, the 9800 for physX would likely slow down perf cause the 670 has so little to do, but at 5760x1080 with all settings maxed and AA on and such, the 9800 would help because the resources of the 670 is tapped out doing the rendering. Plus the FPS would be much lower, making it less likely that the 9800 would have trouble keeping up with physX processing.

I don't think a 9800GTX could ever help a so powerful SLI as a one with 2 x GTX670. Take in mind that if the physics section is not as fast as the rendering one, the rendering one will stop until it has the needed data to keep going...which means that an unbalanced system will never work properly.

Keep in mind that with recent improvements, I believe a GTX670 is much, much, much faster than a 9800GTX using just a tiny fraction with its power, and it could adjust itself to deliver more or less physx performance depending on the situation. So, I'd at least pair a GTX460 with such an SLI in order not to slow it down...but nothing inferior.
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post #703 of 1506
Been trying to get stable sli clocks, sofar the highest I can get is +50 which when boosted is about 1240 for me.
Perf. - http://3dmark.com/3dm11/3396686
Extreme - http://3dmark.com/3dm11/3396828

Absolutely loving how quiet these cards are, they barely ramp up at all, and are hardly noticable! Had some very weird issues when I first installed the 2nd card, had several hard freezes one of which caused my bios settings to wipe, so had to redo my CPU settings, even had a couple of times at very low overclocks on the gpus (I think they were +20) and 3dmark would crash and would lock the computer.. But thankfully that seems to have stopped.. Not sure what was going on..
Edited by marduke83 - 5/11/12 at 8:27am
 
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post #704 of 1506
Thread Starter 
Quote:
Originally Posted by brettjv View Post

What do you mean exactly by "my physics score is poor compared to not having the 9800 plugged in at all."

Setting 9800 to 'dedicated' physx:
3DMark Score P8207
Graphics Score 9072
Physics Score 6382
Combined Score 6381

Setting 9800 to 'auto' physx:
3DMark Score P8943
Graphics Score 9530
Physics Score 7939
Combined Score 7032

unplugged 9800:
3DMark Score P9431
Graphics Score 9827
Physics Score 8858
Combined Score 7827
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post #705 of 1506
Quote:
Originally Posted by prava View Post

I don't think a 9800GTX could ever help a so powerful SLI as a one with 2 x GTX670. Take in mind that if the physics section is not as fast as the rendering one, the rendering one will stop until it has the needed data to keep going...which means that an unbalanced system will never work properly.
Keep in mind that with recent improvements, I believe a GTX670 is much, much, much faster than a 9800GTX using just a tiny fraction with its power, and it could adjust itself to deliver more or less physx performance depending on the situation. So, I'd at least pair a GTX460 with such an SLI in order not to slow it down...but nothing inferior.

He only has one 670 though, which is roughly 470 SLI speed (what I have now) and I've run an 8800GT for PhysX in my rig, and never found a test where my FPS was slower with 8800 as a dedicated card vs. running physX on one of the cards in my SLi set.

Well, except FluidMark, but that's because it's basically just a PhysX test ... the rendering portion of it is about as tough to run as World of Goo. It's not representative of a gaming load by any stretch ... but the results of this test is unfortunately what a lot people around here base their presumptions about physX upon.
    
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post #706 of 1506
Quote:
Originally Posted by Martyr82 View Post

Setting 9800 to 'dedicated' physx:
3DMark Score P8207
Graphics Score 9072
Physics Score 6382
Combined Score 6381
Setting 9800 to 'auto' physx:
3DMark Score P8943
Graphics Score 9530
Physics Score 7939
Combined Score 7032
unplugged 9800:
3DMark Score P9431
Graphics Score 9827
Physics Score 8858
Combined Score 7827

Hrrrm ... very interesting. In theory there should actually be zero difference in any of these scenarios because 3dMark11 simply does not use PhysX at all.

So these results are odd and unexpected to me. It's most likely a driver bug that will eventually be ironed out, cause whatever you do with the PhysX settings or what card you use or don't use ... it shouldn't make any difference on that test.

If you want to try benching something that actually supports PhysX, try it with Mafia 2 or Batman Arkham Asylum. If you don't own them, they both have free demo's and both demo's have benchmarking apps built in.

Something you have to understand here is that PhysX and Physics are not synonymous. PhysX is a physics calculation engine, but there are many different physics engines, such as Havoc, or the one used by 3dMark11 (forget the name offhand). And which engine is used is specific to the particular application, they're not interchangeable. If a game engine uses Havoc physics engine instead of PhysX, then your GPU will not be used to do physics calculations. That only happens with specific games that support Hardware PhysX, like Batman, Mafia 2, Mirrors Edge, and Alice.

In fact, there's also software (i.e. CPU) based PhysX, so not even every game that supports "PhysX" necessarily supports HARDWARE (i.e. GPU) PhysX.
Edited by brettjv - 5/11/12 at 9:08am
    
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post #707 of 1506
Quote:
Originally Posted by brettjv View Post

Hrrrm ... very interesting. In theory there should actually be zero difference in any of these scenarios because 3dMark11 simply does not use PhysX at all.
So these results are odd and unexpected to me. It's most likely a driver bug that will eventually be ironed out, cause whatever you do with the PhysX settings or what card you use or don't use ... it shouldn't make any difference on that test.
If you want to try benching something that actually supports PhysX, try it with Mafia 2 or Batman Arkham Asylum. If you don't own them, they both have free demo's and both demo's have benchmarking apps built in.

I wonder if this might be caused by the fact that the motherboard (Gigabyte Z68X-UD3R-B3) 's first PCIEx16 slot (housing the GTX670, I suppose) will drop to x8 when the 9800GTX is inserted in the second PCIEx16 slot which also runs in x8.
post #708 of 1506
Quote:
Originally Posted by windfire View Post

I wonder if this might be caused by the fact that the motherboard (Gigabyte Z68X-UD3R-B3) 's first PCIEx16 slot (housing the GTX670, I suppose) will drop to x8 when the 9800GTX is inserted in the second PCIEx16 slot which also runs in x8.

Interesting theory Windy my friend ... however it would seem to only explain why run 3 is faster than runs 1 and 2 ... it doesn't explain though why 2 > 1 wink.gif
Edited by brettjv - 5/11/12 at 9:50am
    
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post #709 of 1506
Hey sorry that I'm late too the party...but if someone could help me out...reps will be given

Does this model have a fan speed lock? I believe reference cards are 80%, which kinda sucks, especially if you want to keep your card cool with an overclock, and game with headphones

Also, does this card support upping voltage like the previous Gen cards? Or does the card automatically down volt itself (to factory parameters) anytime it detects the user upping voltage?
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post #710 of 1506
Quote:
Originally Posted by steven88 View Post

Hey sorry that I'm late too the party...but if someone could help me out...reps will be given
Does this model have a fan speed lock? I believe reference cards are 80%, which kinda sucks, especially if you want to keep your card cool with an overclock, and game with headphones
Also, does this card support upping voltage like the previous Gen cards? Or does the card automatically down volt itself (to factory parameters) anytime it detects the user upping voltage?

I don't believe it locks at 80% as i've seen a review where they said specifically they increased the fan to 100% to test its overclocking potential

It has locked volts just like every other 670 right now, so you can't manually change the voltage.
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