Hardocp are being paid by manufacturers to review their products!? Really?!
Some of the reports about this are a bit conspiracy-ish, but basically a lot of these sites are dependent on the Manufacturer to send them samples to review. To stay in their good books most sites will invariably have a bit of bias. Some will have a lot (TomsHardware) and some will have very little.
In some cases, a review which doesn't paint the card in favourable light can result in the site being blacklisted, resulting in some websites (like JonnyGuru) having to buy the cards in instead of getting free samples.