Just keep an eye on the costings.
If u can source the bits cheap and have confidence with an iron, then go for it. Some of the gfxcard pcbs can be a real pita to solder, but those should be just surface mounted with nice large contact areas.
There could ofc be an underlying problem as to why they fried - or it could be them. If there's a problem, they'll go again, so aslong as u haven't spent much replacing them u'll feel ok chucking it out after.
If u bought it tho, return it.
Nice pic tho