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1  Other / CPU/GPU Bitcoin mining hardware / What makes a good mining card? on: April 28, 2013, 04:54:13 AM
I am new to this so I don't know what I am doing really.

But I was wondering if anybody has figured out exactly what on the video card makes it so good at mining?

For some examples, I was looking at some video cards like the 7950 and others and noticed sometimes the manufacturer (IE MSI, Asus, etc...) would tweak things to differentiate themselves from the rest.

Some of the things I saw different was most cards were 128bit, while one would be tweaked to be 256bit.

Another had more shaders than the others.  Some had more onboard memory.

How do all these things affect the hashrate is my ultimate question.  Would I bet better off buying that special card that has 256bit bandwidth over the 128bit versions?  Would I be better off with more shaders? Or ram?

Is there anyway to look at the specs of a card and kinda figure out what it's hashrate would be? Or is it all wait until some sucker buys it and tries it?
2  Other / CPU/GPU Bitcoin mining hardware / CPU requirements for GPU Mining on: April 28, 2013, 03:36:46 AM
I know for gaming that the CPU can bottleneck the GPU.  But can this occur during mining?

I am running a old Intel C2D E6600 on a nVidia 680i SLI MB.  Currently I am running a GTX 460 which sucks.  So I am planning on upgrading to a 7950 to mine with.  I know this card is way overkill for my cpu and motherboard for gaming.  But I want to turn this rig into a mining rig mostly and will do some minor gaming on.

Will this CPU cause a bottleneck for mining? Originally I was mining Bitcoin using GUIMiner Poclbm which was whacking my CPU for 100% of one core and 50% of the other.

But I recently switched to Lightcoins and am running Cudaminer.  It seems to be running both cores at about 40-50% each.

Anybody know how a 7950 will do in a old system like this?  Will it handle two 7950's? (I know it's a SLI board but it should? work with two ati cards not in SLI/Crossfire mode shouldn't it?)  Eventually I would like to make this a pure mining machine with two 7950's running Linux and buy me a better gaming machine.

Thanks for any assistance.
3  Bitcoin / Bitcoin Technical Support / Extremely high Stales using Stratum on: April 24, 2013, 06:11:37 AM
Hey, I am new to BitCoin and Crypto Currencies.  I signed up for Slush's pool and started mining about 2 weekends ago.  I have a real slow miner (GTX 460) so I only get about 70 Mhash's.  But Originally I was doing just normal GUIMiner without Stratum and was getting maybe 1 Stale a day.  But then as I got more into mining I found out about Stratum and decided to run that.

But since I started using Stratum on Sat, I have had 199 Stales.  Some of this is because I turned off the miner to watch some tv and use my pc but even when I let it run uninterrupted I am getting quite a few more stales than I did the normal way.

Everything I read said Stratum was supposed to lower the number of stales.  Is this just because I have such a slow machine?

Thanks.
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