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[Official] AMD Radeon HD 7950/7970/7990 Owners Thread - Page 477

post #4761 of 38701
Quote:
Originally Posted by Hambone07si View Post

No you don't divide it by 2. You have 2 gpus and each one need's it's own ram to run. If you see 3613mb of Vram, each card will be using that, whether 1,2,3, or 4 cards. Your maxing your Vram out. Stay under 3000mb and you will not see the dips.

No....Just flat out wrong...

It's well known that MSI AB reports AMD memory usage wrong, you do infact divide it by the number of GPU's you have so in his case he needs to half it.
post #4762 of 38701
Quote:
Originally Posted by Norlig View Post

whenever I am outside or up flying, my fps drops to mid 45's.
Game is at ultra
Got everything set to Quality, including Super Sampling and Tripple buffering in CCC
Does those settings use that much GPU Power?

It depends, I've not seen the new CCC anti-aliasing options so unless you can do me a screen grab I can't tell you 100%

If you have adaptive anti-aliasing on then that's not the problem as that only applies super sample anti-aliasing to transparent/alpha objects but if there's a ot of smoke and particle on screen it can cripple performance but I can't see it killing your fps that much.

Looking at your screen shots it's not applying super sample anti-aliasing to the whole scene as the IQ is still quite poor and doesn't show any signs that super sample anti-aliasing is being used.
post #4763 of 38701
Quote:
Originally Posted by Mr Frosty View Post

No....Just flat out wrong...
It's well known that MSI AB reports AMD memory usage wrong, you do infact divide it by the number of GPU's you have so in his case he needs to half it.

Well I've been seeing a lot of 2500mb readings while playing games in eyefinity. My 2nd card comes in tomorrow. Your telling me that I will now see 5000mb+?

Here's a Eyefinity setup running maxed settings and it's showing under 3000mbs with 2 cards. Doesn't make sense that he can run 100-160fps on 3 screens and someone on 1 screen can't hold 60fps
http://www.youtube.com/watch?v=Ovm7XBtaQAM
Edited by Hambone07si - 2/23/12 at 12:12pm
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post #4764 of 38701
Quote:
Originally Posted by pfunkmort View Post

I asked this 5-6 pages ago, but I didn't get an answer. Has anyone had any experience with afterburner's user-defined fan profile fluking and getting overwritten randomly by CCC? I can't get it to consistently use the MSI profile. Sometimes it reverts during startup...sometimes just randomly when I'm surfing the web. And my fan will start going up for no reason.

Ye, i do. Does it if i enter ccc/start ccc or start afterburner... only some times tho. I just Un-eble auto fan i ccc then put the custom fan profile in afterburner on and off...
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post #4765 of 38701
Quote:
Originally Posted by Hambone07si View Post

Well I've been seeing a lot of 2500mb readings while playing games in eyefinity. My 2nd card comes in tomorrow. Your telling me that I will now see 5000mb+?
Here's a Eyefinity setup running maxed settings and it's showing under 3000mbs with 2 cards. Doesn't make sense that he can run 100-160fps on 3 screens and someone on 1 screen can't hold 60fps
http://www.youtube.com/watch?v=Ovm7XBtaQAM

His screen shots are showing 3.6Gb of VRAM in use, That's imposible for two reaons :

1. His frame rate would be single digits due to sheer amount of texture thrashing the game would be causing
2. After burner reads VRAM use from the display driver, It would not report a value that's more VRAM then what he has.
post #4766 of 38701
I play BF3 at 1080p Ultra settings with 4xMSAA and my VRAM usage hovers around 1.6GB
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post #4767 of 38701
Quote:
Originally Posted by Hambone07si View Post

Well I've been seeing a lot of 2500mb readings while playing games in eyefinity. My 2nd card comes in tomorrow. Your telling me that I will now see 5000mb+?
Here's a Eyefinity setup running maxed settings and it's showing under 3000mbs with 2 cards. Doesn't make sense that he can run 100-160fps on 3 screens and someone on 1 screen can't hold 60fps
http://www.youtube.com/watch?v=Ovm7XBtaQAM

In CrossfireX, you don't not "stack" VRAM on top of each other.

Having 2 or 3 or even 4 cards means you only have access to 3.0GB of VRAM and every card, while using its own memory, is all cloned of each other.

It wasn't until a few beta releases ago, we couldn't even see VRAM usage on ATI/AMD cards.

They are correct, the total memory you see is incorrect. One card yes, but 2+ cards its counting the "cloned memory" as individual video card memory being used.

Its been claimed that its Memory displayed / Number of GPUs in CrossfireX. The reason for this it that the Memory Usage / GPUs correlates to the VRAM usage of other cards with lesser memory, such as the 6970 with its 2GB of VRAM, and again 6970 users would compare to 1.5GB GTX 580s and see about the same VRAM usage at times with similar settings.

The symptoms of hitting 3.5GB VRAM on our cards would equate to a BSOD/Crash To Desktop or if it was still running the game, less than 1 frame per second.

This coupled with the fact that most titles run fine at 1920x1080 with Max settings on GPUs that have at most 1.5GB. I know BF3 pushes it a little higher to 1.6~1.65GB of VRAM on max settings but not many other titles save for Witcher 2 do this at 1920x1080. So we know for a fact that the cards could not even be hitting 3500+MB.

Also to note: How the drivers store information into VRAM isn't always indicative of whats absolutely needed. nVidia have been known to cache a lot more extra information in Crysis 2 for the 3GB GTX 580s, yet it runs the exact same FPS as the 1.5GB GTX 580s despite using an extra 1GB of VRAM. Just because your card is using 2500MB, which is completely ridiculously high for a single monitor or EyeFinity, means that the driver is caching textures instead of placing them in your RAM or worse streaming from HDD. You getting a second or third card does not guarantee an increase to 5000 MB, its a dynamic number. Besides you are forgetting that smaller VRAM cards are running BF3 no problem like the 6970 with only 2GB of VRAM and the GTX 580 with its 1.5GB of VRAM as mentioned before.

Nordlig's issue isn't with VRAM, its that one GPU is at 66% and the other at 44%. I would anticipate something like FPS limiter is on or VSYNC.
Edited by RagingCain - 2/23/12 at 1:37pm
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post #4768 of 38701
That is right, no matter how many 3gb cards u have, u will only have 3gb of vram.
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post #4769 of 38701
Hey guys I can't seem to overclock with MSI Afterburner with the pre-certified 12.2 drivers. Nothing will stick and it always defaults to the lowest numbers. I read somewhere that the newest drivers kill third party overclocking... any information for me to get around this would be much appreciated.
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post #4770 of 38701
Quote:
Originally Posted by RagingCain View Post


Norlig's issue isn't with VRAM, its that one GPU is at 66% and the other at 44%. I would anticipate something like FPS limiter is on or VSYNC.

Those are Fan speed Percentages, The GPU Usage is the furthest ones to the left wink.gif
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