Topic: [SOLVED] 7950 Struggling to break 420 KH/s (Read 1537 times)

Thanks atp, I just spent the past couple hours switching over to SGMiner and tuning the settings in the program.  I feel like an idiot, but I'm pretty sure I just had them labeled wrong    In device manager the 7950 is listed first, then the 270x, even though the 270x is in the 1st PCIe slot     Right now, I have each card in a separate instance and they are sitting ~460-467 and 600-608 respectfully, which is right on par with their estimates     My clocks ended up being 1055/1500 I 21 and 1160/1690 I 23

 I wanna know, what is the powertune option really used for?  In what I found online, it basically seemed to provide extra voltage to the card when needed and everyone's config file has +20%.  That's what I started with, but as I dropped it the stability and speed increased so both are -20% now!

About your 7950 "LE":  I got a couple of those (off ebay), and they are odd beasts.  Same 7870XT shader count, but the 384bit bus like the 79xx cards (unlike the 7870XT).  Very odd.  That being said, all of mine do at least 600khs+, but i've had little luck getting them above the ~620khs mark whereas the 'normal' 1792 shader 7950s i have @ 680-700khs.

About 7950s with intensity over 13:  7950s love 19+ intensity.  You just need a high enough TC value (24000) works great to support the higher intensity. 7970s are the ones which like the i-13 settings (which is also weird, as it is functionally the same architecture as the 7950, but with a couple extra shader blocks enabled).

About your hashrate issues: I am nearly 100% positive that if you pulled out that 270x, your 7950 would clock back up to ~600khs.  CGMiner really hates tuning for multiple types of cards in the same config file.  If i were in your situation, i would give SGMiner a shot as the dev behind it has stated he has fixed issues like that (specifically the 7970 + 7950 issue with gpu threads of different sizes).  If you do use CGMiner, use one of the smaller optimized .bin (to work with the 270x)  and make sure your config TC setting matches.  My farm gained an entire 1mhs over 13 7950s going to sgminer + optimized bin.

Late last night I reinstalled the drivers + app sdk for both cards and rebooted, ran a steady 560 KH/s on the 270x and only 420 on the 7950 all night (still on).  I messed with the clocks through cgminer, but the highest I could get it to run steady with no driver crashes was 1000/1500 @ 21712 concurrency and I 20, powertune 20.  

Some people say 7950's shouldn't go over I 13 either because of mad HW errors, is that true?  When my intensity is at 13, my hash is barely 320 KH/s.  At I 20 I have no HW errors all night.

I somehow don't think I will get more than this though, either the cards just been OC'd to shit before me and/or ran real hot.  Most people seem to get ~600 kh/s on these cards with those exact settings, or even less.

I did buy this off eBay which could explain it , but the seller sent me his settings (above) and said it should hit 580-600+ easily....  He didn't have an exact model number listed, but the device_ID in my device manager does match up to a 7950.  

All the info he had listed was this "This is an unreleased 7950. I call it a 7950 LE because it only has 1596 shaders instead of the 1756 shaders of a normal 7950 other then that it's a normal 7950 with 3GB RAM 384bit 925mhz core and 1250mhz memory. The card overclocks good.  I used it for litecoin mining for awhile and was able to get 600 Khash very easy."

Hmmm, I can't set my thread concurrency that high.  Nothing over 21712 runs, the display driver crashes.  With the clocks changed to what you suggested scrap it actually lowered my hash rate too, down to around 360 kh/s...  I've also noticed higher results running each card separately then in 1 instance; don't know if this is just temporary, I'll have to run it over night and see where it averages out to.  

Should I try different drivers then 13.12 ?

try 1375 mem and 925 for the core, with a thread concurrency of 40960, intensity 19/20. thats what i have for my 7950, getting 600+ max is about 620

I reinstalled all the drivers and I'm running 565 on the R9 270x and 460 on the 7950.  I had tried installing MSI Afterburner beta 18, but immediately afterward my R9 would barely hit 200 KH and the 7950 was hopping between 350 and 430 so I removed it.  I'm just messing around in CGMiner's settings right now and manually changing the values, but I'm still not getting anywhere close to 600+kh I was expecting from the 7950.

[Fixed!]  I switched to SGMiner and pretty sure I had them labeled incorrectly 


I have 2 cards up and hashing away, but I cannot get my 7950 above 420 kh/s.  The 270x is at 550 solid which is what I anticipated, I found these settings on reddit.  Any higher would be better though~!

I've messed with the clocks a little, it is set to 1000/1500mhz right now.  Won't go any higher though (saw some push it to 1100/1700; mine locks the system up and crashes)

Using latest AMD drivers + sdk also.

Here's my settings, Sapphire DualX R9 270x is GPU 0, AMD 7950 is GPU 1.

"intensity" : "19,20",
"vectors" : "1,1",
"worksize" : "256,256",
"kernel" : "scrypt,scrypt",
"lookup-gap" : "0",
"thread-concurrency" : "20400,21712",
"shaders" : "0",
"gpu-engine" : "0-0,1000",
"gpu-fan" : "0-85,auto",
"gpu-memclock" : "0,1500",
"gpu-memdiff" : "0",
"gpu-powertune" : "0,20",
"gpu-vddc" : "0.000,d",
"temp-cutoff" : "90,90",
"temp-overheat" : "80,80",
"temp-target" : "70,70",
"api-mcast-port" : "4028",
"api-port" : "4028",
"expiry" : "120",
"gpu-dyninterval" : "7",
"gpu-platform" : "0",
"gpu-threads" : "1",
"hotplug" : "5",
"log" : "1",
"no-pool-disable" : true,
"no-submit-stale" : true,
"queue" : "1",
"scan-time" : "30",
"scrypt" : true,
"temp-hysteresis" : "3",
"shares" : "0",
"kernel-path" : "/usr/local/bin",
"device" : "0,1"