7950 BTC vs. LTC hashrate

[ranlo]

Ok, managed to fix it with a couple of tweaks:

--shaders 1792 --intensity 16 --worksize 256 -g 1 --thread-concurrency 21712  --lookup-gap 2 --gpu-engine 1000 --gpu-memclock 1400

lowered the gpu engine and meclock, and upped int by 1. Going fine so far. I'll let it run for a while longer, see if anything comes up.

On a side note: the GPU seems to be running a bit hotter, might drop Int back down to prevent it.


EDIT: I rummaged through some of the CGminer options, and it lists my current gpu engine at 810 rather than the 1000 my batch file asks for. Any suggestions?

The faster you hash, the hotter it's going to get. Basically you're overclocking the system AND running it at max capacity 24/7. This is really where you have to decide "how hot is too hot" for you. IIRC 10c difference is essentially a 50% cut on estimated life of the device.

I prefer using 75C as my max limit, since im always afraid I'll one day wake up to find a melted 7950....

My room is somewhat hot so mine's usually at 77-79. When it hits 80 that's when I worry. Wish I had a lower ambient temperature, lol.

[ReploidX9]

Completely forgot about ambience >.> i guess running over 75 makes sense when you run 2 pcs and live in a room that is pretty much a greenhouse even with windows open...

[ranlo]

Completely forgot about ambience >.> i guess running over 75 makes sense when you run 2 pcs and live in a room that is pretty much a greenhouse even with windows open...

Haha, that's basically what I'm in right now. 100F+ outside, no central air, window units for AC's but I hate running the AC 24/7 so I just turn it on every couple hours for a little while to cool down the room.

[ReploidX9]

This maybe the first time i WANT it to be freezing cold..

[ranlo]

This maybe the first time i WANT it to be freezing cold..

Oh, for sure. I hate the heat anyways. I love winter. If I could go anywhere it'd be Alaska...

[Deatz]

Are you sure its worth the electricity? I dont think it would be.

There are so many variables when it comes to the cost of electricity. In the area that I am in, electricity is relatively cheap compared to most.  With this in mind with a 7950 and a 6850 running currently my current cost is .36 USD a day.  For me it is profitable too for others it would be not be. I would recommend getting a Kill-A-Watt and seeing what the impact is before making a decision.

[Amph]

firs of all set those things
comand prompt with administrator privilege
setx GPU_USE_SYNC_OBJECTS 1
setx GPU_MAX_ALLOC_PERCENT=100

now for getting 600KH with cgminer and 1100 core and a 7950 on cgminer shortcut
--scrypt --thread-concurrency 24000 --lookup-gap 2 -w 256 -I 20 -g 1

this if you want to use your pc and mining at the same time, but only 525KH
--scrypt --gpu-threads 2 --worksize 256 --thread-concurrency 8192 -I 13

Thanks for the info! this allowed me to increase my hashrate to what it should be.

Awesome information! What voltage is your card set at when doing this?

i haven't tried to underclock even more, maybe it work

[ranlo]

firs of all set those things
comand prompt with administrator privilege
setx GPU_USE_SYNC_OBJECTS 1
setx GPU_MAX_ALLOC_PERCENT=100

now for getting 600KH with cgminer and 1100 core and a 7950 on cgminer shortcut
--scrypt --thread-concurrency 24000 --lookup-gap 2 -w 256 -I 20 -g 1

this if you want to use your pc and mining at the same time, but only 525KH
--scrypt --gpu-threads 2 --worksize 256 --thread-concurrency 8192 -I 13

Thanks for the info! this allowed me to increase my hashrate to what it should be.

Awesome information! What voltage is your card set at when doing this?

i haven't tried to underclock even more, maybe it work

Very helpful image. Thanks! VDDC is the actual voltage, right? And the 7950's run at 1.250 normal?

[pytel]

BTC:610GH/s and LTC:680kH/s stabile on 7950 with 1150 GPU/1450 MEM.

[xauberer]

7970 full OC

BTC: 682 mh/s
LTC 491 kh/s before crashing

for some reason cgminer with my card is extremely unstable, can't make it work with two gpus' in the same case and crashing after OC is normal

case is bigtower, well ventilated... I will change cooling for gpu anyway.

[hatted]

I prefer using 75C as my max limit, since im always afraid I'll one day wake up to find a melted 7950....

I think you should check the VRM instead of the GPU, it can melt much faster. 
My 7970 can have 70C GPU with 100C+ VRM easily with extreme loads, like mining, when overclocked....

[Sebacious]

Core voltages are set as (1mV per 1MHz)+10mV, and my memory voltage is brought down to 1500mV.

I use a ratio of Clock Speed x 1.535 = Memory Speed. Intensity = 20, concurrency = 22,400, 1 GPU thread.

955/1466 -> 565 - 580kh/s
977/1500 -> 585 - 595kh/s
1010/1550 -> 590 - 615kh/s
1043/1600 -> 605 - 635kh/s
1075/1650 -> 640 - 658kh/s
1113/1700 -> 670 - 680kh/s
1140/1750 -> 675 - 695kh/s

The slower of the two is the launch day model, and is probably slower because it's displaying my desktop at a 144hz refresh rate. I can only run the cards at 700+kh/s during the winter when my ambient temps are 60F or lower.

[ranlo]

Core voltages are set as (1mV per 1MHz)+10mV, and my memory voltage is brought down to 1500mV.

I use a ratio of Clock Speed x 1.535 = Memory Speed. Intensity = 20, concurrency = 22,400, 1 GPU thread.

955/1466 -> 565 - 580kh/s
977/1500 -> 585 - 595kh/s
1010/1550 -> 590 - 615kh/s
1043/1600 -> 605 - 635kh/s
1075/1650 -> 640 - 658kh/s
1113/1700 -> 670 - 680kh/s
1140/1750 -> 675 - 695kh/s

The slower of the two is the launch day model, and is probably slower because it's displaying my desktop at a 144hz refresh rate. I can only run the cards at 700+kh/s during the winter when my ambient temps are 60F or lower.

I just found out that apparently I can't change the voltage on my card (Trixx shows the changes, but GPU-Z and CGMiner both show the stock voltage). Along with this, I can't change the memory clock speed (Trixx again shows what I set it to, but CGMiner and GPU-Z show different).

That sucks, .

[Sebacious]

I just found out that apparently I can't change the voltage on my card (Trixx shows the changes, but GPU-Z and CGMiner both show the stock voltage). Along with this, I can't change the memory clock speed (Trixx again shows what I set it to, but CGMiner and GPU-Z show different).

That sucks, .

Many cards are voltage locked, many aren't.  Try again using MSI afterburner with unofficial overclock mode turned on.  If that fails, see if you can flash your card's bios to another with a lower voltage setting.

Furthermore, cgminer always shows incorrect GPU voltages for my card.  It will show 1.25v even when I'm running at 1.0v

[Amph]

firs of all set those things
comand prompt with administrator privilege
setx GPU_USE_SYNC_OBJECTS 1
setx GPU_MAX_ALLOC_PERCENT=100

now for getting 600KH with cgminer and 1100 core and a 7950 on cgminer shortcut
--scrypt --thread-concurrency 24000 --lookup-gap 2 -w 256 -I 20 -g 1

this if you want to use your pc and mining at the same time, but only 525KH
--scrypt --gpu-threads 2 --worksize 256 --thread-concurrency 8192 -I 13

Thanks for the info! this allowed me to increase my hashrate to what it should be.

Awesome information! What voltage is your card set at when doing this?

i haven't tried to underclock even more, maybe it work

Very helpful image. Thanks! VDDC is the actual voltage, right? And the 7950's run at 1.250 normal?

yeah is the voltage,  and 1250 is the default ram, i just overclocked the core, is more stable in this way

[bongwater]

LTC hashrate is superior.

[bongwater]

Ok, managed to fix it with a couple of tweaks:

--shaders 1792 --intensity 16 --worksize 256 -g 1 --thread-concurrency 21712  --lookup-gap 2 --gpu-engine 1000 --gpu-memclock 1400

lowered the gpu engine and meclock, and upped int by 1. Going fine so far. I'll let it run for a while longer, see if anything comes up.

On a side note: the GPU seems to be running a bit hotter, might drop Int back down to prevent it.


EDIT: I rummaged through some of the CGminer options, and it lists my current gpu engine at 810 rather than the 1000 my batch file asks for. Any suggestions?

The faster you hash, the hotter it's going to get. Basically you're overclocking the system AND running it at max capacity 24/7. This is really where you have to decide "how hot is too hot" for you. IIRC 10c difference is essentially a 50% cut on estimated life of the device.

I prefer using 75C as my max limit, since im always afraid I'll one day wake up to find a melted 7950....

Thanks I just changed mine to 75C on max limit, appreciate it.