So you were getting two kinds of BSODs, but only one type was manifesting with the new RAM? As for the type of BSOD, a 0xC4 just means a specialized embedded Driver Verifier check for Windows discovered a driver doing something bad, and caught it in its tracks. Of course, hardware can manifest these crashes too, since hardware problems can alter driver operations, which can end up having Windows point finger at the driver, not the hardware. That's what gets tricky about analyzing crashdumps; Windows almost always crashes blaming drivers/software as responsible, because that's all it can really see. It's up to the analyst to scrutinize the data and figure, "Ok, the software meant to do one thing but the hardware had it do something else. That's a hardware problem." Only exceptions are specialized crashes like the WHEA crashes, and sometimes TDR crashes and 0xF4 crashes, and that's only because the hardware reports to Windows that it actually discovered a problem. Anyways, pardon the rant. Go ahead and send it to the shop. Lord willing if the system isn't that old they'll be lenient with ya.