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Probably customer returns for one reason or another, dont have the right PSU/connections, changed their mind, dont like the noise fans etc. Usually nothing wrong with them but if the seal has been broken they cant sell them as new hence b grade. Warranty is down to the manufacturer some dont accept b grades with full warranty some brands do give you the full remaining warranty. B Grade is usually a punt and I've had some tremendous bargains in the past but for that price I wouldnt risk it personally. However nothing to stop you ringing OCUK and offering them price minus £200-£300 they can always say no, or they might accept and you get a nice reduction. End of day you can always return it again if not satisfied. Depends if you have the cash to splash.Couldn't find any post. Are the listed 5090 grade b all missing ROPs?
You would have to be mental to buy a near 2k b grade GPU IMO?!