You won't be getting much out of a 9500 GT.  Even with CUDA, it just can't do integer operations as quickly as recent CPUs.  Take a tour of https://en.bitcoin.it/wiki/Mining_Hardware_Comparison to see what your other options could be.

From what I understand of the first of these two posts is that your Core2 Duo is already faster than your GPU.  However, if you intend on this system being used primarily for mining, you could keep the CPU you have and replace the GPU (given your power supply can handle the higher wattage).  In fact, the CPU you have still has some legs in some of the more recent games (except Civ V and some Starcraft II battles) and could see some benefit to having a better GPU and another 2GB of RAM.  The RAM wouldn't be necessary for a purely mining machine, though.

Give ufasoft's SSE2 miner a go.  I have an i7-950 running at 3.83 GHz that can produce 18.9 Mhash/s.  You should probably get somewhere in the 14.5-15.8 Mhash/s range, depending on the thermals in your case.  Also, an nVidia G 310 has a really hard time post processing HD video clips, so mining isn't going to be worthwhile on this card.


AMD vs. Intel depends on the miner you run.  I know on my quad core I get roughly 16 Mhash/s at stock speeds (I'm assuming an AMD 975 BE would be somewhere in this range, as well) so be sure you use the best miner for your hardware.  In my experience, disabling HyperThreading doesn't really help when running ufasoft's miner.  Besides, if you set a miner up for 4 threads, Windows will do the job of parking the virtual threads unless another CPU heavy application suddenly needs them.


Ehm...  I guess this sounds like something you can try, but I'm under the assumption that SSE2 floating point operations still utilize the FPU SSE2 ALU operations utilize the same ALUs that non-SSE2 instructions would use, so running two types of miners at once would be somewhat counter-productive.  Also, using ufasoft's miner, I got better results running with 8 threads over 4, but that could be limited to the i7-9xx series parts.


Some of this seems a little off.  The nVidia G 310 is a GT200 based GPU.  It does in fact support both CUDA and OpenCL.  If you're comfortable tweaking command line parameters, I would suggest looking into puddinpop's RPC CUDA miner as well as m0mchil's Python OpenCL miner.  After tweaking paramaters, you'll probably find that, for your G 310, the CUDA miner will be about 5% faster.


Depending on the CPU, you're probably in the same boat.  There isn't enough processing power on one of these lower end cards to do integer operations with any significant speed.  If you have a particularly fast CPU, these GPUs aren't going to match the performance you'll get on the CPU.

EDIT: I removed references to FPUs.  Hashing and FPUs shouldn't go together.

No, it is not a typo. He had in mind that having a low mhps for some high end ATI card is a problem.