legoman666 said:
So I took the chart and found the lowest price for each card (inc rebates) on newegg. Then I divided the avg PPD by the cost.
The card with the best ratio is the 8800GS with 52.63PPD/$. The next highest is the 8800GT 256MB @ 46.07PPD/$.
Updated. The numbers previously listed were based on older data.
I'm going to try to incorporate energy costs. I scoured the internet to get aprox system energy usage on the various cards while loaded. I'll also assume a $0.10/KWh cost (your local cost may be different) and then extropolate all PPD and costs over a two year lifetime.
Code:
Orig Energy Points
Card PPD W Cost Cost Per
$ $/y $
8800GTS 4223 283 150 248 4770
8800GTX 4538 228 170 200 5810
8800GT 256 4607 236 100 207 6540
8800GT 512 4762 269 125 236 5820
8800 Ultra 4950 330 236 289 4440
9800 GX2 9996 289 330 253 8730
8800 GTS 92 5512 264 150 231 6570
9800 GTX 5937 212 170 185 8030
GTX 260 6476 263 245 230 6710
GTX 280 6901 313 400 274 5310
GTX 280 SLI 13002 508 800 445 5620
9800GX2 SLI 19992 461 660 404 9940
8800 GT SLI 9524 271 250 237 9602
Most of the loaded System Wattage comes from AnandTech from a variety of video card reviews.
The 9800 GX2 has the PPD doubled on the assumption of running two clients.
The SLI versions have had their PPD doubled assuming twice the clients. so the x2 SLI'd version has 4 clients.
The Points per dollar does not include any CPU/SMP clients that may also be running
The GPU2 PPD is assuming a CPU capable of running the GPU client at its maximum.
The Energy cost/year calculation = System Wattage/1000 (to convert to KW) x 365days x 24Hr x .1($ 0.10 per KWh)
Example GTX 280: $274/year = 313W x 365 days x 24 hours x .1 ($/KWh) / 1000
So to get the points/$ over two years = PPD x 365 days x 2 years / (Original Cost + Energy Cost/year x 2 years)
Example GTX 280: 5310 = 6901 x 365 x2 / ($400 + 2 x 274).
I'm making this so that others can judge a more realistic cost for GPU2 folding. The Wattage numbers are at best an estimate since they have not been measured while actually folding and they incorporate the entire system but different computer are more or less efficient. So take the numbers with a certain grain of salt. That being said, I think they may have a value to some.