Before thinking your RAM or HDD might be bad try a registry cleaner.
Since the registry is opened so many times when the computer is being used, it can cause such errors. Getting such errors is so common today because a registry almost contains 1 million files that can get corrupted at any time. The operating system of the PC becomes perplexed and it opens windows wrongly making it understandable to read after some time. A registry cleaner can help you in cleaning those registry files that are responsible for producing such blue screen dump errors. With the help of a registry cleaner, it is now able to use your computer without worrying about the appearance of any kind of blue screen error messages.
Fix Blue Screen Physical Memory Dump Error is easy to do with registry cleaner. If you scan your computer it will detect all the errors in your registry and safely remove them.
it happens with and with out games, tried reg. cleaner no luck, just finished redoing my drives and set them to raid, seems stable for now but only an hour into it. still cant get it to overclock, i know it can be done but it wont let me so i reset the mother board to stock settings....
Were you raising your multiplier by increasing it one number at a time and running a stability test afterwards until you could not boot and then adjusting your voltage one increment at a time until it would boot or did you just go straight to 4.5?
Honestly there is really not much need for high OC's if you have a good system to begin with. I saw hardly any difference when I jumped to 4.5ghz on the i5-2500k. Juts brought a FPS in games up around 5-7 more...which I guess is an Ok increase.
Oh, look around some more in that Turbo V program I believe that they have preset OC's that jump by .2 that you can select that it will boost you to instead of just letting the system choose. I know the new z68 boards have them. I believe they start out at 3.6 then go to 3.8>4.0>4.2 and 4.4ghz