Keep them... dunno if Apple are still bastards about it but if you ever bring you Mac Pro in for service, you should put the original RAM in or your 3rd-party stuff might disappear.
(f) to damage caused by
service (including upgrades and expansions) performed by anyone who is not a representative of Apple or
an Apple Authorized Service Provider (“AASP”); (g) to a product or part that has been modified to alter
functionality or capability without the written permission of Apple;
And I'm pretty sure Apple cannot void your warranty as long as you install hardware by the book. As long as it's standard hardware and no special modifications or overclocking.
Keep them... dunno if Apple are still bastards about it but if you ever bring you Mac Pro in for service, you should put the original RAM in or your 3rd-party stuff might disappear.
True. I got my RAM snaked by applecare techs. After an update my old 2.33Ghz MBP would no longer boot. Turns out it was the RAM. Sent it in with 3GB, got it back with 2GB.