Yes It may be a memory stick problem. You may have a defective memory stick. I had this problem sometime ago with my brand new memory stick. Had it replaced and my crashing stopped. Try another memory stick perhaps borrow it from your brother's or sister's CPU.
7900GS is quite a powerful card to run SH3. I don't think it's the card.
Another thing which may be causing you the distress is that your GPU, that is your graphics card, is failing. Check this with a PC technician.
Good luck
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