4 cards one card really slow hash rate no hw

[pauldulong]

Hello,

I have a rig with 4x 7950. However, in CGminer 1 card is slower every time. It doesn't show any HW errors.
Do you have any ideas?
https://www.evernote.com/shard/s12/sh/142e941a-e050-4e4a-a50a-1e1adac54c6d/f869928847056f38625949f22198c4dd/res/e97143c9-18ce-4a81-9658-202fb79b2e79/skitch.png?resizeSmall&width=832

Thanks

Paul

[duniek]

Hello,

I have a rig with 4x 7950. However, in CGminer 1 card is slower every time. It doesn't show any HW errors.
Do you have any ideas?
[im]https://www.evernote.com/shard/s12/sh/142e941a-e050-4e4a-a50a-1e1adac54c6d/f869928847056f38625949f22198c4dd/res/e97143c9-18ce-4a81-9658-202fb79b2e79/skitch.png?resizeSmall&width=832[/img]

Thanks

Paul

i think its normal
I have 3 7970 gigabyte/xfx non refference and refference asus - 1st 590-610, 2nd 550-580, 3rd 420-450 only

[tugvarish]

I know the previous answer said it's normal... but to me it seems off.
I have multiple rigs with multiple cards and what I can say is that the hash rate fluctuate especially depending on your stats refresh rate.
But if you look at the average rate it should even as you move over a longer period of time.
Try to run some tests per single card, like run only one card at a time over 5 to 10 minutes and see what the average is for that card running single.
Then run all the cards for 5 to 10 minutes and compare to see if the average is very different.
Also note if the "problem" (a card is slower) happens always on the same card or varies or not happens at all when they run single.
If same card has the "problem" then switch the slots and power cable and do it again.
It could be the slot, or power related.