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April 02, 2013, 12:19:38 AM |
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HD5970 HD6990 and upcoming HD7990 are dual GPU cards. It means there are two GPU chips on single card. If run from single x1 PCI-E link they will actually be like two cards running on half-link each. I'm not sure how much this will affect the performance.
HD5970 are very rare card now. HD6990 are probably more powerful than HD7970 but takes more electricity. HD7990 non-reference designs are available from few manufacturers in extremely limited availability.
For mining it will make sense to buy second-hand motherboard with two or three full-size PCI-E slots, install best GPU card You can get, add cheapest CPU for that socket, get cheap used 1 or 2GB ram and cheapest HDD You can get that can hold the operating system. Get powerful and efficient power supply that can feed the cards. Mining with laptop is not convenient. It will not be portable and will need constant external power for GPU card. Hope this helps.
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