-RX are B-Stock and recertified products, these carry a limited 90 day warranty.

-BR, -B1, -BX, -DR come with a 1 year warranty.

-LA, -LE, -LR, -LX, -T1, -TR, -TX, -T2 are eligible for a 2 year limited warranty if registered within 30 days of purchase.

-K1, -KR products are eligible for a 3 year limited warranty if registered within the first 30 days of purchase.

-GR products are eligible for a 5 year limited warranty if registered within the first 30 days of purchase.

-A1, -A2, -A3, -A4, -AR, -AX, -CR, -CX, -DX, -FR, -FX, -SG, -SX models are eligible for the step-up program and carry a limited lifetime warranty upon registration within 30 days of purchase.

There is no quality or performance differences between any of the various models, however -RX products are recertified.

Link to full warranty information: http://www.evga.com/support/warranty/