Dual GPU's not making 2x the credit...

dunx
dunx
Joined: 13 Aug 10
Posts: 119
Credit: 53,470,527
RAC: 0

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 ...

astrocrab
astrocrab
Joined: 28 Jan 08
Posts: 208
Credit: 429,202,534
RAC: 0

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.

DanNeely
DanNeely
Joined: 4 Sep 05
Posts: 1,364
Credit: 3,562,358,667
RAC: 1

RE: i have the same

Quote:
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.

dunx
dunx
Joined: 13 Aug 10
Posts: 119
Credit: 53,470,527
RAC: 0

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

mikey
mikey
Joined: 22 Jan 05
Posts: 12,147
Credit: 1,837,418,437
RAC: 135,852

RE: For my other Projects

Quote:

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!

DanNeely
DanNeely
Joined: 4 Sep 05
Posts: 1,364
Credit: 3,562,358,667
RAC: 1

RE: RE: For my other

Quote:
Quote:

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).

mikey
mikey
Joined: 22 Jan 05
Posts: 12,147
Credit: 1,837,418,437
RAC: 135,852

RE: RE: RE: For my

Quote:
Quote:
Quote:

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.

Tex1954
Tex1954
Joined: 15 Mar 11
Posts: 28
Credit: 740,697,590
RAC: 658,219

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

Comment viewing options

Select your preferred way to display the comments and click "Save settings" to activate your changes.