Quote from: Thor78 on November 27, 2016, 07:50:22 PM

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is anyone using a R9 290 non-x and R9 290x together?
What is the difference in hasing power between them at roughly same GPU and mem clocks?
Thanxx.

Not much difference....

GPU0 and GPU2 on risers = 290s, GPU1 in PCI slot = 290x. All 3 x GPUs are modded with Stilt ROM.
Claymore v8, -i 6, W10, Celeron 1840 on ASrock H81 Pro BTC, 8GB RAM, 24-34GB Windows Virtual Memory.

=====
ZEC: 11/28/16-03:13:49 - SHARE FOUND - (GPU 1)
ZEC: Share accepted (78 ms)!
GPU0 t=78C fan=99%, GPU1 t=80C fan=99%, GPU2 t=77C fan=99%
ZEC: 11/28/16-03:13:53 - SHARE FOUND - (GPU 2)
ZEC: Share accepted (78 ms)!
ZEC: 11/28/16-03:14:02 - New job from cn1-zcash.flypool.org:3333
ZEC - Total Speed: 810.672 H/s, Total Shares: 78457, Rejected: 32, Time: 73:43
ZEC: GPU0 267.759 H/s, GPU1 280.460 H/s, GPU2 262.452 H/s
ZEC: 11/28/16-03:14:07 - SHARE FOUND - (GPU 0)
ZEC: Share accepted (78 ms)!
ZEC: 11/28/16-03:14:10 - SHARE FOUND - (GPU 1)
ZEC: Share accepted (79 ms)!
=====

The 290X speed is 280 while the 290 speed is 264. So that is about 6% differece. If the frequency is the same, that is still some increase.

I have way more rejected shares Sad

Why fans all 99% ?

I bought them used for a test rig. The 290s are notorious for being loud and hot.

So -fanmax 99 is better than an overheated GPU, you can always replace fans....

I have seven 280x, I take down the originals fans and put on fans that I buy on the web, I think the price was about 1.3 eur for one fan, I put 3 fans per card. Supply for that fans I take directly 12V so they are always on 100%. When they starts slowing down, I just take some silicon oil in spray and they run like new. Beacuse they always run on 100%, my cards run cooler.

Link to fans http:http://www.banggood.com/3-Pin-80mm-15mm-PC-CPU-Cooling-Fan-Heatsink-Cooler-Radiator-For-Computer-12V-p-997476.html