Re: [ANN] cudaMiner - a new litecoin mining application [Windows/Linux]
6x 750 Ti's (OC'd to stable + BIOS Power Mod)
-2x Zotac Reference
-4x ASUS OC'd w/ 6-pin PCIe header
-1x ASUS OC'd w/ 6-pin PCIe header (not currently in use...someone please help me get 7 cards working on a Z87-Pro!)
ASUS Z87-Pro
Intel G3220
4GB DDR1333
1kW PSU
320GB HDD
6x USB3.0 x1-x16 Powered Riser Cable Assemblies
W/ Windows 8.1 , scaling past two cards was futile--even placed in x16 slots and running at PCIe 3.0 x8 for each, there was a small performance hit. With six cards in the riser cables, I could not get > 230-240kH/s from the cards...some had a hard time hitting 200Kh/s. I was not getting above 1400 kH/s. Machine was not stable enough to allow for overclocking via software tool (MSI AB).
Same HW setup w/ Ubuntu 12.04 yielded about 1600 kH/s (BIOS power mod+modest MEM CLK increase).
Same HW setup w/ WINDOWS 7, was able to individually OC with MSI AB, each card, and get ~ 1750 kH/s out of six riser'd cards. This is the closest I could get to the 1800 kH/s holy grail.
Someone mentioned about that disabling iGPU would allow for the 7th PCie slot to be utilized? That sounds interesting.
I also have witnessed the performance degradtion from using anything but a PCIe 3.0 x16 slot in that native mode. Going down to x8 makes a small hit. Forcing a PCIe 3.0 x16 slot to operate in x1 mode does cause about the same performance hit as a x1 riser.
SO there were two issues going on here...the x1 / riser performance hit....and then a WIndows 8.1 scalability issue. No idea WTF was going on with W8.1, but I'm sticking iwth W7x64 for now for sure.
Just having six cards connected + W8.1 = unstable feeling system.
Here is screen capture of W7x64 with six riser'd GTX 750 Ti's.
http://1drv.ms/1fBX72c
My feeling is that I'm leaving about 10-30 kH/s per card on the table because of x1 slots / risers.
-2x Zotac Reference
-4x ASUS OC'd w/ 6-pin PCIe header
-1x ASUS OC'd w/ 6-pin PCIe header (not currently in use...someone please help me get 7 cards working on a Z87-Pro!)
ASUS Z87-Pro
Intel G3220
4GB DDR1333
1kW PSU
320GB HDD
6x USB3.0 x1-x16 Powered Riser Cable Assemblies
W/ Windows 8.1 , scaling past two cards was futile--even placed in x16 slots and running at PCIe 3.0 x8 for each, there was a small performance hit. With six cards in the riser cables, I could not get > 230-240kH/s from the cards...some had a hard time hitting 200Kh/s. I was not getting above 1400 kH/s. Machine was not stable enough to allow for overclocking via software tool (MSI AB).
Same HW setup w/ Ubuntu 12.04 yielded about 1600 kH/s (BIOS power mod+modest MEM CLK increase).
Same HW setup w/ WINDOWS 7, was able to individually OC with MSI AB, each card, and get ~ 1750 kH/s out of six riser'd cards. This is the closest I could get to the 1800 kH/s holy grail.
Someone mentioned about that disabling iGPU would allow for the 7th PCie slot to be utilized? That sounds interesting.
I also have witnessed the performance degradtion from using anything but a PCIe 3.0 x16 slot in that native mode. Going down to x8 makes a small hit. Forcing a PCIe 3.0 x16 slot to operate in x1 mode does cause about the same performance hit as a x1 riser.
SO there were two issues going on here...the x1 / riser performance hit....and then a WIndows 8.1 scalability issue. No idea WTF was going on with W8.1, but I'm sticking iwth W7x64 for now for sure.
Just having six cards connected + W8.1 = unstable feeling system.
Here is screen capture of W7x64 with six riser'd GTX 750 Ti's.
http://1drv.ms/1fBX72c
My feeling is that I'm leaving about 10-30 kH/s per card on the table because of x1 slots / risers.