400KH/s with 2 ASUS Radeon HD 7790 Cards.. good?

Trillium

hero member

Activity: 546

Merit: 500

~~247.5 kh/s~~ 246-247 kH/s

Asus 7790 with CUII cooler (dual fan, with heatpipes)

7790's have dynamically regulated power output, which limits your maximum overclock, probably to protect VRMs. I couldn't get it to ever exceed 79 watts as reported in GPU-Z, not even for a moment. At stock it reports 73-75 watts @ 100 % load. You have to underclock these cards to a specific region & ratio of frequencies to get the most efficient mining (most KH/s for the least watts possible).

Using msi afterburner and GPU-z, cg miner 3.3.0

48 deg C temperature after 30 minutes, in 30 deg C ambient room.

Power limit: +20% (I am not sure this actually does anything, it may be ignored by the card)
Core: 830 MHz
RAM: 1500 MHz
Fan: 100%

~~"intensity" : "18",~~ revised to 17 because of extremely high rejects (25+%), setting to 17 solves it with nil change to kH/s
"vectors" : "1",
"worksize" : "128",
"kernel" : "scrypt",
"lookup-gap" : "2",
"thread-concurrency" : "8000",
"shaders" : "896",

GPU-Z reports power consumption varying between 54 and 55 watts.

Wattmeter measurements:

Full system while mining (two cards installed): 220 watts
Full system while mining (one card installed): 147 watts
Full system while idle: 85

So at least the cards are using less than their TDP (85 watts).

mrhood

member

Activity: 190

Merit: 10

Wow! thanks! that instantly helped. now I am getting a solid 230K!

Many thanks!

mattopia

newbie

Activity: 42

Merit: 0

I have 3 7790's (well, 2 running right now, had to pull one to make room for a 280x). They are good little cards. I'm getting a solid 235k, but it took some tweaking. These cards seem to start having massive hardware issues and other weirdness if you go too far with intensity or stray out of the engine/ram ratio they like.

Here are my cgminer settings, maybe give them a try as a baseline and go from there. (I took out my pool configs and other irrelevent stuff, you will need to add the pool stuff back in)

cgminer --scrypt -I17 -w 128 --thread-concurrency 8000 --gpu-engine 880 --gpu-memclock 1500 --temp-target 70 --auto-fan

I'm sure there's room for improvement but that's where I stopped, and I'm happy with the results.

Good luck!

mrhood

member

Activity: 190

Merit: 10

I am now getting this error . Failed to reinit GPU Thread

I am running a 500W power supply. Could this be the reason?

.bat setup

cgminer.exe --scrypt -o stratum+tcp://stratum.dogehouse.org:3333 -u XXXX -p XXXX -I 17 -g 2 -w 128 --thread-concurrency 8000

efx

sr. member

Activity: 378

Merit: 250

Quote from: eon89 on December 30, 2013, 10:28:02 PM

I get about 250k from mine.

You need to change some of the settings on the card, I found underclocking it some actually increased mining performance. No idea if good performance I was just playing with settings and that was best for me.

That's something people often notice. The reason it happens is because scrypt likes certain core to ram ratios and the ideal ratio is pretty variable. I often hear .7 core:ram, but that's just a general starting point and the clocks I posted from the hardware guide are in the range of point five core to ram clocks. Looks like this specific arc prefers very highly clocked ram.

I bet if you kept your original core clock and OC'ed your memory instead of underclocking the core, your hashrate would be higher.

efx

sr. member

Activity: 378

Merit: 250

Quote from: mrhood on December 30, 2013, 10:19:37 PM

I have 2 ASUS Radeon HD 7790 Cards. I am getting about 200KH/s on each GPU. Is this good? Is there a way I can get more?

This is my current .bat file setup

cgminer.exe --scrypt -o stratum+tcp://stratum.dogehouse.org:3333 -u XXXX -p XXXX -I 17 -g 2 -w 128 --thread-concurrency 8000

Thanks in advance

What happens with higher intensity? Is one of the GPUs for desktop display that you actively use? Otherwise, higher intensity should result in better hashrates. The workload parameter usually provides the best performance at 256 rather than 128, the latter being better suited to a desktop that is in use since it tends to reduce the gpu latency you get when mining heavily.

Thread concurrency is the value that's most likely holding you back, I suggest trying many, many variations, the ideal value seems to vary by bios and not just stream processor count or amount of GPU memory.

The two best scores on the hardware guide are both around 270 (260 @882/1750), so you have some more hashrate in there someplace. I see all but one posted their scores with 8000 thread concurrency, so perhaps you will not see any benefit from adjustments to that parameter but I still think it's worth some experimenting.

eon89

sr. member

Activity: 308

Merit: 292

★YoBit.Net★ 350+ Coins Exchange & Dice

I get about 250k from mine.

You need to change some of the settings on the card, I found underclocking it some actually increased mining performance. No idea if good performance I was just playing with settings and that was best for me.

hvezdasmrti

sr. member

Activity: 797

Merit: 251

200 khashes i have with 7770. 220 when i OC it.

Verdict:

BAD.

Nullu

hero member

Activity: 532

Merit: 500

That actually sounds quite low for AMD cards.

I'm no expert at CGminer, but you may need to tweak your settings.

mrhood

member

Activity: 190

Merit: 10

I have 2 ASUS Radeon HD 7790 Cards. I am getting about 200KH/s on each GPU. Is this good? Is there a way I can get more?

This is my current .bat file setup

cgminer.exe --scrypt -o stratum+tcp://stratum.dogehouse.org:3333 -u XXXX -p XXXX -I 17 -g 2 -w 128 --thread-concurrency 8000

Thanks in advance

Topic: 400KH/s with 2 ASUS Radeon HD 7790 Cards.. good? (Read 2581 times)