problem with my hd7950

[asdlolciterquit]

Spent days with your same problem. It ended up mainly being memory clock and thread concurrency.
This is getting me 675kh/s:
Core:1160
Memory:1550

setx GPU_MAX_ALLOC_PERCENT 100
cgminer --scrypt -o stratum+tcp://server.com:3333 -u user.name -p password -w 256 -g 1 --lookup-gap 2 -I 19 --thread-concurrency 21712 --gpu-powertune 20

but i can't use that value of I and TC

[asdlolciterquit]

problems, problems, problems!

I've try my hd7950 with an other pc, with 8gb ddr3. Like someone have said, 4gb wasn't enought. With 8gb, i can use I = 17, maybe even more!
But now i have other problems! I CAN'T setting any value of TC!! Simply, if i write  "--thread-concurrency" followed by any correct number (ever low, like 8192), i have a lot of HW!!

Why?

i use like before cgmier 3.7.2 and catalyst 13.9...

[CosaNostra]

It won't work with I > 13 and TC = 8192. You will be getting HW errors!
Try to increase TC gradually: e.g.  8192 -> 12000 -> 16000 -> 18000 -> 20000 -> 24000
Leave away intensity and overclocking. Set them to defaults.
Then, when you will reach max thread concurrency, try to increase intensity the same way.
And then overclocking and tuning (powertune, etc.).
Have you executed this in a batch file or with the command line (this is important):

setx GPU_MAX_ALLOC_PERCENT 100

 
This is my cgminer.conf for the 7950 running on a shitty 10 years computer with 4GB memory and giving 600+ khashes.

"intensity" : "20",
"vectors" : "1",
"worksize" : "256",
"kernel" : "scrypt",
"lookup-gap" : "2",
"thread-concurrency" : "24000",
"shaders" : "0",
"gpu-engine" : "1000-1150",
"gpu-fan" : "50-100",
"gpu-memclock" : "1250",
"gpu-memdiff" : "0",
"gpu-powertune" : "20",
"gpu-vddc" : "1.000",
"temp-cutoff" : "85",
"temp-overheat" : "75",
"temp-target" : "65",
"api-port" : "4028",
"auto-fan" : true,
"auto-gpu" : true,
"expiry" : "120",
"gpu-dyninterval" : "7",
"gpu-platform" : "0",
"gpu-threads" : "1",
"hotplug" : "5",
"log" : "5",
"no-pool-disable" : true,
"no-submit-stale" : true,
"queue" : "3",
"scan-time" : "30",
"scrypt" : true,
"temp-hysteresis" : "3",
"shares" : "0",
"kernel-path" : "/usr/local/bin"

[sgk]

Here are some Cgminer settings for popular video cards:
http://switchercoin.com/gettingstarted

See if their settings for HD7950 work for you.

[titolr10]

Just answer simple question, did you set both setx command and restart CMD?
Do not use any batch file, just go to catalog with cgminer and run
cgminer with your pool account and tc 22000. If there is error that this is too much,
probably there is issue with setx options. I have the same when i don't use this option and restart cmd

[asdlolciterquit]

Just answer simple question, did you set both setx command and restart CMD?
Do not use any batch file, just go to catalog with cgminer and run
cgminer with your pool account and tc 22000. If there is error that this is too much,
probably there is issue with setx options. I have the same when i don't use this option and restart cmd

uhm..now it seem it's work!!

but i have to do some more test to be sure. One question: why you choose 22000?

[titolr10]

It does not deppend on tc, just one of best tc for this card. It all depends on setx max alloc.
Simple step:

1. Run cmd
2. Setx
3. Exit cmd
4. Run cmd
5. Run Cgminer.

And setx commands in windows must be set only one time, so now it all should work properly

[asdlolciterquit]

thx man!

[titolr10]

Have fun with mining

[asdlolciterquit]

is it the same if i overclock with msi afterburn or i set the new frequency in my cgimer .conf?

[krazietek]

Just so i don't leave the thread with what ended up being the issue with my Sapphire 7950.

1. I did not have the set allocation at the beginning of my batch file. I did do it in DOS but for some reason the memory was still being allocated.   
What this did was allow me to get over the TC - 8192. Also I added the "del *.bin" at the top of the batch file because of what i read the .bin files can cause issues.

del *.bin
set GPU_MAX_ALLOC_PERCENT=100
setx GPU_MAX_ALLOC_PERCENT 100

2. Also i re-installed windows due to GPU-Z was telling me my AMD drivers were having errors. I was playing with different drivers maybe they all did not get removed properly and causing conflicts.

3. I was having a issue where every hour or so my PC would shut down and i noticed that the USB devices were going to sleep. I had all ready ran through my power settings ensuring they were set to "never sleep/shut down", but i did not do it to the USB or the PCIe settings so i am assuming that did help and or issue #2 might have had something to do with that as well.

I am running at about ~660 kh/s.

Thank you for all the replies! 

[asdlolciterquit]

Just so i don't leave the thread with what ended up being the issue with my Sapphire 7950.

1. I did not have the set allocation at the beginning of my batch file. I did do it in DOS but for some reason the memory was still being allocated.   
What this did was allow me to get over the TC - 8192. Also I added the "del *.bin" at the top of the batch file because of what i read the .bin files can cause issues.

del *.bin
set GPU_MAX_ALLOC_PERCENT=100
setx GPU_MAX_ALLOC_PERCENT 100

2. Also i re-installed windows due to GPU-Z was telling me my AMD drivers were having errors. I was playing with different drivers maybe they all did not get removed properly and causing conflicts.

3. I was having a issue where every hour or so my PC would shut down and i noticed that the USB devices were going to sleep. I had all ready ran through my power settings ensuring they were set to "never sleep/shut down", but i did not do it to the USB or the PCIe settings so i am assuming that did help and or issue #2 might have had something to do with that as well.

I am running at about ~660 kh/s.

Thank you for all the replies! 

is this (set GPU_MAX_ALLOC_PERCENT=100) really usefull?

[darksoft]

Just so i don't leave the thread with what ended up being the issue with my Sapphire 7950.

1. I did not have the set allocation at the beginning of my batch file. I did do it in DOS but for some reason the memory was still being allocated.   
What this did was allow me to get over the TC - 8192. Also I added the "del *.bin" at the top of the batch file because of what i read the .bin files can cause issues.

del *.bin
set GPU_MAX_ALLOC_PERCENT=100
setx GPU_MAX_ALLOC_PERCENT 100

2. Also i re-installed windows due to GPU-Z was telling me my AMD drivers were having errors. I was playing with different drivers maybe they all did not get removed properly and causing conflicts.

3. I was having a issue where every hour or so my PC would shut down and i noticed that the USB devices were going to sleep. I had all ready ran through my power settings ensuring they were set to "never sleep/shut down", but i did not do it to the USB or the PCIe settings so i am assuming that did help and or issue #2 might have had something to do with that as well.

I am running at about ~660 kh/s.

Thank you for all the replies! 

is this (set GPU_MAX_ALLOC_PERCENT=100) really usefull?

No, it is wrong.

[asdlolciterquit]

Just so i don't leave the thread with what ended up being the issue with my Sapphire 7950.

1. I did not have the set allocation at the beginning of my batch file. I did do it in DOS but for some reason the memory was still being allocated.   
What this did was allow me to get over the TC - 8192. Also I added the "del *.bin" at the top of the batch file because of what i read the .bin files can cause issues.

del *.bin
set GPU_MAX_ALLOC_PERCENT=100
setx GPU_MAX_ALLOC_PERCENT 100

2. Also i re-installed windows due to GPU-Z was telling me my AMD drivers were having errors. I was playing with different drivers maybe they all did not get removed properly and causing conflicts.

3. I was having a issue where every hour or so my PC would shut down and i noticed that the USB devices were going to sleep. I had all ready ran through my power settings ensuring they were set to "never sleep/shut down", but i did not do it to the USB or the PCIe settings so i am assuming that did help and or issue #2 might have had something to do with that as well.

I am running at about ~660 kh/s.

Thank you for all the replies! 

is this (set GPU_MAX_ALLOC_PERCENT=100) really usefull?

No, it is wrong.

thx!!

one question: when i run cmd as administrator, in which path i have to write del *.bin?

[titolr10]

In your cgminer folder