Thanks!Sick system!!
Post some minesweeper benchmarks when you get a chance.
I will, as soon as I'm done with Pong and PacMan. So far, all I can say is that I've never seen Space Invaders run so smooth!
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Thanks!Sick system!!
Post some minesweeper benchmarks when you get a chance.
Hey, I would like to apologize for my previous posts (before the edits). Mornings are not my best time. Regarding 4-way vs Quad SLI, I thought the same thing until Dan_D pointed it out. I agree that there shouldn't be a difference, but he's saying otherwise
Thank you for the benchmarks! I'm afraid that it's not only a problem in Heaven, since I got exactly the same results in Dragon Age II and Heroes VI. No difference in performance between 2-way SLI and 4-way SLI! I submitted a ticket to nVidia about this last night, we'll see what they say.
Laugh all you want, I'm only getting 42 fps in Dragon Age 2 and 29 fps in Heroes VI at 8064x1440.Dragon Age + 4x SLI = lol ( no matter what resolution )
Hey guys, I have some updates for you. For some reason, now I get similar FPS at 1440p in Heaven with both "Span displays with Surround" and "Maximize 3D performance".
I think I'm starting to see what's happening here and why nVidia hasn't answered my support ticket. First of all, I would like to say that I'm not an engineer. Also, I really hope that I'm wrong about this and that nVidia can fix this through a driver update. You guys can judge this for yourselves, I'll just leave it here.
Intutively, I would assume that if I increase the resolution by 3.15 (2560x1440 to 8064x1440 bezel corrected), then, if the cards scale well, I can approximate my FPS by taking the FPS at 2560x1440 and dividing it by 3.15. So if I get 106.8 FPS at 2560x1440, then I should get somewhere around 33.9 FPS at 8064x1440, maybe even more if I was getting a CPU bottleneck at the lower resolution.
Unfortunately, that's not the case. In reality, I get 23.9 FPS at 8064x1440.
Here are my results from 2560x1400 and 8064x1440 runs in Heaven 3.0. I'm using nVidia 304.79 drivers and the cards are running at stock clocks except for 122% power target.
2560x1440
8064x1440
What's going on? The story becomes more clear when you look at the PrecisionX graphs. I spliced them together, since I can't fit the stats for 4 GPUs on one screen.
2560x1440
8064x1440
Looking at GPU usage and GPU temps, it becomes clear that at 8064x1440 the GPU's aren't even close to being engaged to their full potential. It looks like GK104 doesn't have enough VRAM bandwidth for 4GB. I guess now it makes sense why nVidia originally released them with 2GB frame buffer and 256-bit bus width. It also makes sense that the GK110 rumors say that it will come with 4GB and 512-bit bus.
Overall, right now it looks like the 4GB GK104 is a scam by AIB partners. You simply can't benefit from the extra VRAM.
It's not CPU limited, I tried overclocking the VRAM and I got a 10% increase in FPS from a 13.3% increase in VRAM clock (3005 to 3405). I can do the same test at 3.5GHz CPU clock when I get home, but I think that my FPS will be the same.Have you considered that you could be CPU limited on that resolution? Can you try 3 card SLI on this resolution and check what fps can you get? If you loose 20~25% fps, your might be correct that video memory bandwidth is limited as 4GB memory is only an increase of memory size instead of memory bandwidth, which can be theoretically calculated by multiplying the memory interface bitness with memory frequency and number of SLI cards (Ex: 256bit * 1GHz * 4). If the fps is dropped less than 20%, it is possible that the system is CPU limited on that resolution for that game. It does need a lot of CPU power to drive ~12M pixels(8064x1440)
we have known for months what the specs of GK110 will be and that it will have a 384 bit bus not a 512 bit.Hey guys, I have some updates for you. For some reason, now I get similar FPS at 1440p in Heaven with both "Span displays with Surround" and "Maximize 3D performance".
I think I'm starting to see what's happening here and why nVidia hasn't answered my support ticket. First of all, I would like to say that I'm not an engineer. Also, I really hope that I'm wrong about this and that nVidia can fix this through a driver update. You guys can judge this for yourselves, I'll just leave it here.
Intutively, I would assume that if I increase the resolution by 3.15 (2560x1440 to 8064x1440 bezel corrected), then, if the cards scale well, I can approximate my FPS by taking the FPS at 2560x1440 and dividing it by 3.15. So if I get 106.8 FPS at 2560x1440, then I should get somewhere around 33.9 FPS at 8064x1440, maybe even more if I was getting a CPU bottleneck at the lower resolution.
Unfortunately, that's not the case. In reality, I get 23.9 FPS at 8064x1440.
Here are my results from 2560x1400 and 8064x1440 runs in Heaven 3.0. I'm using nVidia 304.79 drivers and the cards are running at stock clocks except for 122% power target.
snip
Looking at GPU usage and GPU temps, it becomes clear that at 8064x1440 the GPU's aren't even close to being engaged to their full potential. It looks like GK104 doesn't have enough VRAM bandwidth for 4GB. I guess now it makes sense why nVidia originally released them with 2GB frame buffer and 256-bit bus width. It also makes sense that the GK110 rumors say that it will come with 4GB and 512-bit bus.
Overall, right now it looks like the 4GB GK104 is a scam by AIB partners. You simply can't benefit from the extra VRAM.
Oops, my badwe have known for months what the specs of GK110 will be and that it will have a 384 bit bus not a 512 bit.
and could you use the edit button instead of making back to back posts 2 minutes apart?Also, for the love of all things holy, could you please use preview thumbnails instead of the actual screenshot fomoz, and yanmeng, could you please not quote the whole picture post? Thanks!
and could you use the edit button instead of making back to back posts 2 minutes apart?
I agree with you 100%. I thought that I could save some money and get away with Z77 with a PLX switch, but I might be wrong. I'll try to find an X79 platform to test this on.Reposting from another thread fomoz is contributing to: he's using Z77, which limits his four cards to 4x PCIe 3.0 lanes each with added latency, both from the PLX switch and from the cards fighting for bandwidth from the CPU.
I don't think this is a fair way to test this setup at all, and that he should make the effort to move to X79. No person in their right mind (I'm not picking on you bro!) should be using four GPUs on a 16-lane board, especially not top-end GPUs, and expect to get anything that could be confused with good scaling.
How do I do that? I'm linking them straight from my Dropbox.Also, for the love of all things holy, could you please use preview thumbnails instead of the actual screenshot fomoz, and yanmeng, could you please not quote the whole picture post? Thanks!
It's a Surround driver issue. Thanks though.You're GPU utilization is all over the place, you need to count out a CPU bottleneck by loading up the GPU's and create a GPU bottleneck, just go easy on the AA.
I agree with you 100%. I thought that I could save some money and get away with Z77 with a PLX switch, but I might be wrong. I'll try to find an X79 platform to test this on.
Having said that, here are a few indications that the PLX switch might not be the bottleneck here:
1. This setup scales well at 2560x1440. Doesn't hitting high FPS mean that I have enough bandwidth?
2. As I mentioned earlier in this thread, increasing the VRAM clock by 13.3% (3005MHz to 3405MHz) resulted in a 10% performance increase in Heaven at 8064x1440.
3. sk3tch has X79, GTX 680 4GB FTW 4-way SLI and 3x 1080p 120Hz. clayton006 has X79, GTX 670 4GB SC 4-way SLI and 3x 1600p. You can read clayton006's thread on EVGA forums here. sk3tch knows about this thread and I'll PM clayton006 about it. As far as I know, they're both having the same problems as me.
4. sambatico has the same issues with GPU usage with GTX 670 4GB 4-way SLI on X79. You can see his post here.
I'll try updating my BIOS and I'm also looking forward to trying out Virtu MVP.
By the way, does anyone know an easy way to disable a GPU for testing? I don't feel like taking out the card and I don't think that my motherboard has a PCI-E slot disable switch.
How do I do that? I'm linking them straight from my Dropbox.
Laugh all you want, I'm only getting 42 fps in Dragon Age 2 and 29 fps in Heroes VI at 8064x1440.
Any progress on this setup?
Supposed to be fixed in 310.xx.
how much power do you pull from the wall?