i have the same problem:
two gtx 560 ti has about 20% in performance lost each compared to single gtx 560 ti. cpu does not play role. my 6 core phenom has load less when 25%.
so i found what 1 gpu card per 1 main board is the best result.
i have the same problem:
two gtx 560 ti has about 20% in performance lost each compared to single gtx 560 ti. cpu does not play role. my 6 core phenom has load less when 25%.
so i found what 1 gpu card per 1 main board is the best result.
Unless you're running an x90 chipset you can only run 1 PCIe card at 16x speed, 2 will drop them both to 8x. 99% of the time this doesn't matter, but the current BRP app spends a lot of time sending data back and forth from the CPU to the GPU and is hurt by having only 8x bandwidth.
All recent intel consumer chipsets except x58 (LGA 1366 cpus) have the same issue. Some high end LGA1155/56 boards have PCIe multiplier chips (eg NF200) that will let 2 or more GPUs think they each have 16 lanes to use. This works fine for gaming since most of the traffic is from one GPU to the second; however they still only have a total of 16 lanes to talk to the CPU, so it's of limited value there. It's not totally useless since if the traffic isn't at a constant level each card can get burst speeds above 8x if the other card is momentarily idle.
My credits have soared since I expanded my desktop onto both GPU's... I have no need for two monitors, so hadn't done this, and mine was crippled at around 133% instead of 180% Daily credit has now climbed from 18K to 32K per day for the two cards.
For my other Projects I'm looking for an ATI 5870 for one of the other PC's.
For my other Projects I'm looking for an ATI 5870 for one of the other PC's.
dunx
I have a 5870 and LOVE IT!! Mine is at Collatz and is still winding up after leaving Dnetc, but at Dnetc it used to get around 300k per day I think. It is at 150k per day right now at Collatz. Now each project is different so the credits will be different, as you well know!
For my other Projects I'm looking for an ATI 5870 for one of the other PC's.
dunx
I have a 5870 and LOVE IT!! Mine is at Collatz and is still winding up after leaving Dnetc, but at Dnetc it used to get around 300k per day I think. It is at 150k per day right now at Collatz. Now each project is different so the credits will be different, as you well know!
I'm getting about 180k/day from MW on my 5870 with a a slight underclock (noise reasons).
For my other Projects I'm looking for an ATI 5870 for one of the other PC's.
dunx
I have a 5870 and LOVE IT!! Mine is at Collatz and is still winding up after leaving Dnetc, but at Dnetc it used to get around 300k per day I think. It is at 150k per day right now at Collatz. Now each project is different so the credits will be different, as you well know!
I'm getting about 180k/day from MW on my 5870 with a a slight underclock (noise reasons).
And I was WRONG, mine was getting around 150k to 160k on Dnetc, not twice that as I said previously!! Mine is getting 156,414.20 as of today at Collatz.
Just an FYI, you may find your slower results are from the "Sticky Downclock" problem Nvidia has with the new drivers. There is another thread descibing this and worth checking into.
That is why I checked on things, 2 cards suddenly were taking twice as long to do tasks... turned out to be the downclock was the issue.
As stated mine has 3 of 16X
)
As stated mine has 3 of 16X slots, or if you used single slot GPU's you could run 6 of them @ 8X...
I also run six HT cores on CPU Wu's and leave 2 HT cores for feeding the GTX 460's
dunx
P.S. I have recently almost doubled my output by the simple matter of setting Windows 7 desktop to ...
i have the same problem: two
)
i have the same problem:
two gtx 560 ti has about 20% in performance lost each compared to single gtx 560 ti. cpu does not play role. my 6 core phenom has load less when 25%.
so i found what 1 gpu card per 1 main board is the best result.
RE: i have the same
)
Unless you're running an x90 chipset you can only run 1 PCIe card at 16x speed, 2 will drop them both to 8x. 99% of the time this doesn't matter, but the current BRP app spends a lot of time sending data back and forth from the CPU to the GPU and is hurt by having only 8x bandwidth.
All recent intel consumer chipsets except x58 (LGA 1366 cpus) have the same issue. Some high end LGA1155/56 boards have PCIe multiplier chips (eg NF200) that will let 2 or more GPUs think they each have 16 lanes to use. This works fine for gaming since most of the traffic is from one GPU to the second; however they still only have a total of 16 lanes to talk to the CPU, so it's of limited value there. It's not totally useless since if the traffic isn't at a constant level each card can get burst speeds above 8x if the other card is momentarily idle.
My credits have soared since
)
My credits have soared since I expanded my desktop onto both GPU's... I have no need for two monitors, so hadn't done this, and mine was crippled at around 133% instead of 180% Daily credit has now climbed from 18K to 32K per day for the two cards.
For my other Projects I'm looking for an ATI 5870 for one of the other PC's.
dunx
RE: For my other Projects
)
I have a 5870 and LOVE IT!! Mine is at Collatz and is still winding up after leaving Dnetc, but at Dnetc it used to get around 300k per day I think. It is at 150k per day right now at Collatz. Now each project is different so the credits will be different, as you well know!
RE: RE: For my other
)
I'm getting about 180k/day from MW on my 5870 with a a slight underclock (noise reasons).
RE: RE: RE: For my
)
And I was WRONG, mine was getting around 150k to 160k on Dnetc, not twice that as I said previously!! Mine is getting 156,414.20 as of today at Collatz.
Just an FYI, you may find
)
Just an FYI, you may find your slower results are from the "Sticky Downclock" problem Nvidia has with the new drivers. There is another thread descibing this and worth checking into.
That is why I checked on things, 2 cards suddenly were taking twice as long to do tasks... turned out to be the downclock was the issue.
:D