I am mining N5 with cayars nvminer 1.2. Two rigs on Windows 7 64 bit and both using 335.23 driver. Only difference is cpu and gpu manufacturer but way different results. Gpu's are factory overclocked and at these settings. Cpu's are not overclocked.
Rig A: GPU- 5 750ti's (EVGA SC) CPU- AMD Phenom II X6 1100T (cpu usage about 25% usage, avg) Speed: 35,500 Kh/s or 7,100 Kh/s each card MOBO: Gigaybyte GA-890GPA-UD3H
Rig B: GPU- 5 750ti's (MSI OC) CPU- AMD Phenom II X3 710 (cpu usage about 70% usage, avg) Speed: 26,900 Kh/s or 5,380 Kh/s each card MOBO: Gigaybyte GA-MA790X-UD4P
In my Rig A the gpu load stays above 90% but in Rig B gpu load fluctuates between 30-85%. This happens on all cards in each machine. Both machines have the cards on the same kind of powered usb risers. I can't get the Rig B to over 90% load for nothing. This happens now (I never noticed before but Rig B has always been slower) for any algo mining.
Could it possibly be the cpu? Just curious before I drop money on the cpu. I also know the mobo are not the best in the world but they were very cheap when I got the a while ago. I know I can swap cpu's also but would rather get you all's advice/opinions first. I would rather just go and get a new cpu if needed.
Sorry to quote myself but still looking for ideas.
@cayars thanks for your advice.
Still having same issue on Rig B.
I have switched cpu's and the problem did not go away. So I eliminated that. Switched gpus and same issue.
I can run 4 gpus on Rig B and everything runs fine. As soon as I add the 5th gpu is when everything throttles down.
I have tried 5 different driver versions for Nvidia and no change.
Could it be the mobo or a setting in bios? I am ready to just go buy a new mobo and cpu.
I am literally out of ideas.