Differences between one PC and another

[TheStalker]

I have a GPU (Gigabyte R9 290x Windforce) with those settings:

-I 20 --thread-concurrence 28688 --mem-clock 1500 --worksize 256 --auto-fan

On a PC with an i7 4770 and 4Gb RAM DDR3 (Win7 x64). Doing about 970kh.

I thought that for mining only the GPU matters, so I decided to move the R9 to another PC with a Core2Duo 2.23GHz, 512Mb RAM DDR2 (Win7 x64), but those settings don't work. I needed to put the --thread-concurrence to 512 to cgminer starts (but it doesn't mine, cgminer shows only the pools finding a new block and sometimes I get a rejected warning). Why this happens?

I see many other people setting --thread-concurrence to over 30k and with the PC with an i7 I can't set it to 28689 or the GPU fails, the last working setting is 28688 (yes I tried one by one), someone can help?

Thank you. 

[djm34]

I have a GPU (Gigabyte R9 290x Windforce) with those settings:

-I 20 --thread-concurrence 28688 --mem-clock 1500 --worksize 256 --auto-fan

On a PC with an i7 4770 and 4Gb RAM DDR3 (Win7 x64). Doing about 970kh.

I thought that for mining only the GPU matters, so I decided to move the R9 to another PC with a Core2Duo 2.23GHz, 512Mb RAM DDR2 (Win7 x64), but those settings don't work. I needed to put the --thread-concurrence to 512 to cgminer starts (but it doesn't mine, cgminer shows only the pools finding a new block and sometimes I get a rejected warning). Why this happens?

I see many other people setting --thread-concurrence to over 30k and with the PC with an i7 I can't set it to 28689 or the GPU fails, the last working setting is 28688 (yes I tried one by one), someone can help?

Thank you.  

512MB DDR2... (are they still selling those ?) this isn't really a lot these days...
most miners use ram (or pagefile) when they allocate vram, and I am pretty sure your system already use most of it...
(try to increase the size of the pagefile) but better put more ram. ideally you should have as much ram as vram)

[TheStalker]

Hmm, I didn't know that. Thank you a lot.

[Andrelvogue]

I have a GPU (Gigabyte R9 290x Windforce) with those settings:

-I 20 --thread-concurrence 28688 --mem-clock 1500 --worksize 256 --auto-fan

On a PC with an i7 4770 and 4Gb RAM DDR3 (Win7 x64). Doing about 970kh.

I thought that for mining only the GPU matters, so I decided to move the R9 to another PC with a Core2Duo 2.23GHz, 512Mb RAM DDR2 (Win7 x64), but those settings don't work. I needed to put the --thread-concurrence to 512 to cgminer starts (but it doesn't mine, cgminer shows only the pools finding a new block and sometimes I get a rejected warning). Why this happens?

I see many other people setting --thread-concurrence to over 30k and with the PC with an i7 I can't set it to 28689 or the GPU fails, the last working setting is 28688 (yes I tried one by one), someone can help?

Thank you.  

512MB DDR2... (are they still selling those ?) this isn't really a lot these days...
most miners use ram (or pagefile) when they allocate vram, and I am pretty sure your system already use most of it...
(try to increase the size of the pagefile) but better put more ram. ideally you should have as much ram as vram)

Thank you for the information i had almost the same problem