About 25mhz. Retail = 275/275, OEM = 250/250 (or was it 250/275?) If your like me you get the OEM, I don't live in the US so its about 50% on top of the price of an OEM to go for the Retail.
Many oem cards out there are also 230/230. The performance differential is there but it is pretty easy to overclock them up to retail speeds, but not much further at times.
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