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#1
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16x 4x crossfire with suprising results
This is my first post in here, but I just had something I wanted to share.
Recently I bought my second Asus EAH6950 to crossfire on my Asus P6T. To my disappointment, the two PCI express ports are placed too close together, so the upper card would have a hard time getting ventilated. I found two crossfire bridges of 100 mm, and placed the second 6950 in the third slot on the mobo. To be even further disappointed, I saw the last slot was a x16 but only with x4 speed. I ran a 3dmark11 on the system and scored 8336 or something like that. I then tried to place the second 6950 in the second slot, to reach x16 speed, and ran the test again. It scored 8396! Those two scored are virtually the same in my book. So a P6T crossfire x16 x4 with two Asus EAH6950 is roughly equal to the x16 x16 crossfire. Any thoughts on this? |
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#2
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Not really sure why this is surprising? 16x 16x vs 16x 4x or 8x really is a minor difference and has to have a really hard pushing application to see statistical differences.
Sounds like a win win situation for you.
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MSI P67-GD65 w/ SB 2600K @ 4.2Ghz Sapphire HD 7970 OCZ Vertex 4 128GB |
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#3
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Quote:
But yeah, I was just happy the difference between the setups was so minor just wanted to share if anyone else had the same complications as me.
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#4
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Doesn't this difference increase slightly with resolution?
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#5
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A 4x slot card will incur 10% performance hit at 1080p and a 1x slot card will incur 30% hit, IIRC.
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#6
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Yes it does. OP, run any tests or benchmarks that you run at native res. or as high as possible. Check out the difference there too. In [H] Surround evaluation, 8x became a bottleneck of around 10% at 5760 x 1200, but it's usually nothing major with a single display.
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sabregen: it does... all the time. I post GenMay style pretty much everywhere... and try not to get banned. munkle: but admit the truth you do it just to up your post count. ![]() sabregen: +1. |
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#7
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So theoretically would or better to have an 8x8 than a 16x4?
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#8
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i5-2500K @ 4.4 GHz R9 290X @ 1050/1350 MHz ASUS PB278Q 2560x1440 Titanium HD | JDS Labs O2 | HD650 |
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#9
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What resolution are you gaming at?
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#10
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Yeah, maybe I should get a full version and do a test on the full resolution. I will try that tomorrow. I am gaming on a 27" 2560x1440.
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#11
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How is the actual performance while gaming? Do you notice any strange stutter or anything?
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My Heat http://www.heatware.com/eval.php?id=64929 |
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#12
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#13
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Yeah it's been a long time that the PCI-E bus has been sitting around waiting to be taxed by anything, and for the most part nothing has managed to live up to doing so. Yet people still pay mad premiums for 16x/16x or 16x/16x/16x,
![]() The bright side is happy little accidents for people like OP. Though the unhappy accident of squashing the two x16 slots together is something I am confounded by quite often when looking at mobos. |
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#14
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I run 2X GTX 480's on my P6T motherboard as well. I've tried all the combinations and found that the performance does not make a difference even when SLI X16 and X4. I'm running a 30" Dell at 2560X1600. Benchmarks are virtually the same. This whole X16 buisness is just to sell you on something you don't really need.
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#15
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Try running both gpu in x4 then
![]() J/k, however it seems to matter at eyefinity surround . Oh well.Posted via Mobile Device |
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#16
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Here's my results...
P8P67 LE board running two 6950s in 16x/4x crossfire http://3dmark.com/3dm11/1042255 P8750 P8P67 WS board running two 6950s in 16x/16x crossfire http://3dmark.com/3dm11/1085670 P9228 |
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#17
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#18
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#19
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In related news, I tried Crossfire on a Intel P35 motherboard with 16x/4x PCI Express 1.0 ports and the results were dreadful. Everything I tried except for the Unigine benchmark was slower with Crossfire enabled
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CM 690 II Advanced ][ XFX XTR 650W Core i5 2500K @ 4.4GHz ][ Corsair H50 MSI P67A-G43 ][ 8GB DDR3 800 Asus Strix GTX 970 4GB Intel 330 240GB ][ 2x WD HDDs Alienware TactX KB+M ][ Pioneer 215 DVDRW 3x Samsung S-PVA 214T ][ Brother HL-2140 |
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#20
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so once you hit a traffic jam, it's almost dead stop.
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"I'm actually looking forward to the Windows 8 Family Pack. It contains four licenses of Windows 7 and one license of Windows 8 for the family member you don't particularly care for." - Wonderfield |
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