😉 Not that partic card but basicly when going for OEM over retail you tend to lose the fancy box, manual, longer warranty, free sw and any bundled extras (though TVout lead is often still supplied). So you get the same card offering the same perf and o/c'ability, you just lose the frills. In the days of the Rad8500 you often did lose clock speed, o/c'ability etc but that type of thing is only really seen now in the budget end of the gfx card market like the GF4MX, Rad9100/9200 and GF-FX5200. So long as you're buying at least Rad9500, GF-FX5600 then you should find ALL the cards of the same range of card are for all intents and purposes identical, that's across all manu's too not just OEM vs retail.
😀 If the price is significantly lower go for it, if it's more marginal consider what you are / may be losing although it could still be easily worth it!