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Half load GPUs during Heaven 4.0/ Valley 1.0- Trouble shooting

post #1 of 5
Thread Starter 
Hey guys, I am getting half gpu load for heaven 4.0 and valley 1.0 having everything on extreme settings @ 1920x1080.
When running heaven 3.0/playing bf3/metro2033/etc/etc @ 1920x1080, I normally have over 96% gpu loads.

I have had 96%+ gpu loads with heaven 4.0 using 13.5 Drivers.

Here is an example of Heaven 4.0 benches.

http://i.imgur.com/GUQL9LJ.png

vs

http://i.imgur.com/ZCy7f1X.png

As you can see, There is more or less, double the frame rate difference.

Specs:

CPU: 3820@ 4.625Ghz (stable)
Motherboard: GA-X79-UP4 GPUS are sitting in the first two slots.
RAM: Corsair 1866Mhz 16gb (underclocked to 1666 with timing that match original settings)
Graphic cards: Sapphire 6990 + Visiontek 6990 (they're both on the same bios flash and everything else.
PSU: 1300w gold rated cooler master silent hybrid pro.
Note on the graphic cards: They're both underwater, warmest they've seen is around 60 degrees (including their VRM)


Another quirk: Valley 1.0 @ 5760x1080 starts off around 20-30 fps with all settings on ultra. However, at some point (just prior to the rock scene) it switches to 2.0 fps for some time.
Heaven 4.0 stays at 2-4 fps at 5760x1080 with gpu loads all over the place, but never all together over 50% (ie 50%+/50%+/50%+/50%+)

In terms of other benchmarks,
http://www.3dmark.com/3dm11/6567191?

^3dmark11 results

http://www.3dmark.com/3dm/648606?

^3dmarks

Do note: In the 3dMark results, my "combined" result is pretty pathetic.

I do not see any throttling in either cpu or the gpu when running benchmarks. (at 1920x1080, on other monitors.) at 5760x1080 I've only seen my gpu loads with MSI afterburner on screan display.


Basically what I am asking is for some sort of opinion/idea as to what could be causing this issue of mine.
Edited by thethat - 5/20/13 at 10:50pm
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post #2 of 5
Quote:
CPU: 3820@ 4.625Ghz (stable)
Motherboard: GA-X79-UP4 GPUS are sitting in the first two slots, IE 3.0@ 16x (which is pretty much 2.0@ 16x, and since its a dual card, its pretty much 2.0@ 8x Due to pcie2.0 limit on the 6990s.)


You have a card in the wrong slot. Cayman is pcie 3 so there's no point referring to pcie 2.

One card should go into the top slot, aka pcieX16_1 and the second card into pcieX16_2. The first two slots would be x16 and x8 respectively. You should be using slot 1 and slot 3, which would make it x16 and x16.

How you have setup now, the second card is getting starved because you are splitting the pcieX8_1 slot. Thus the pcei3 x8 is split in half leaving pcie3 x4 for each gpu, which is equivalent to pcie2 x8. That's not that bad in itself however your top card is running at twice the lane width compared to your second card.

Cards are using the AUSUM bios I'm guessing?

That aside, gpu utilization is typically a driver issue barring any hardware issues. Fix the above so both cards are running equally and then look into the driver.

I ran quadfire 6950s previously so I had the chance to directly compare Cayman vs Tahiti. I found that it took two highly clocked Cayman gpu to equal one high clocked Tahiti gpu. You can ballpark the benches to get a rough idea of what a top performing Cayman setup should shoot for. I would guestimate that you should be in the low 100s in valley.


Btw, pcie3 is twice the bandwidth of pcie2.

pcie3x16 = pcie2x32.

pcie3x8 = pcie2x16
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post #3 of 5
Thread Starter 
http://www.amd.com/us/products/desktop/graphics/amd-radeon-hd-6000/hd-6990/pages/amd-radeon-hd-6990-overview.aspx#3

It says that they're PCIe 2.1 x 16 cards.

However, I do see what you're saying. I'll switch the cards as soon as possible. Thanks.
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post #4 of 5
^^Oh you're right doh, I forgot about the multiplexer chip. It's been a longtime since I thought about a 6990. That thing uses the same PLX chip as the 5970 iirc, kind of a let down. That aside the physical slots you have would then all drop down to pcie2. That would mean the cards would still have very lopsided lane widths. So yea fix that first. thumb.gif
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post #5 of 5
Thread Starter 
Fixed cards, heaven 4.0 at 1920x1080 works fine with gpu loads (beta 13.5 drivers)
However, the remaining issues are still there.
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