Computer still running crap after upgrading PSU and motherboard

Hi, i recently posted here about my computer which was running poorly because i didnt have enough amps to run my graphics card, i have since upgraded my psu and also got a new motherboard (from P5K to P5Q SE)

But to my horror i am still have pretty serious lagging/stalling, the computer sometimes freezes for a few seconds and when i start it up it takes a while to get its arse in gear (e.g if i click the start menu it freezes for a few seconds sometimes longer)

the specs are in my signature, if any1 has any clues as to what could be causing it i would be very greatful.

Also i have ran memtest and i dont get any errors, and the weird thing is i can play the latest games pretty well (empire total war, gta iv, godfather ii, etc)
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  1. my signature isnt showing so heres my specs:

    Intel C2D E8400 CPU (Stock)
    Asus P5Q SE
    4x1GB OCZ Platinum (4-4-4) 2.4v
    8800 GTS 512MB (G92)
    160GB SATA HDD
    500W OCZ StealthXStream
    DVD-RW Drive
  2. wow your ram is at a high voltage. even oc'd 1066mhz ram should only be at 2.2v. That might be why it didn't have enough amps before.

    what make is the HDD, can't really see any other reason why it would be stalling, unless your running a really buggy OS or have a virus/trojan.
  3. actually i dont know if the voltage is at that, its jus thats wot it says on the sticks.

    though iv checked my ram and it seems i have 3 different models with different timings
  4. i have jsut removed all my ram and just put 2x1 gb sticks in both 4-4-4, and in cpuz it says there running at 5-5-5-15, is that normal?
  5. ALSO, the memory is running at 1.8v thought it says on the ocz site it should run at 1.9v to 2.2v
  6. The standard DDR2 voltage is 1.8v. Motherboards will run the RAM at 1.8v and loose timings if the RAM is rated at over 1.8v. You need to manually set the RAM speed/timings/voltage in the BIOS to get it to run at its specs. If motherboards didn't run the RAM underclocked out of the box then most high performance RAM that needs more than 1.8v wouldn't even boot up at all. If the sticker on your RAM says 4-4-4-12 @ 2.2v, that's what you need to manually set in the BIOS.
  7. Yes, i have now tried every combination, basically i have 5 sticks of 1gb, 3 of them (i hav jus found out) are specifically made for a DFI lan party motherboard, the other 2 are normal ocz platinum 4-4-4-15, but i have ran them in every combination, with and without changing the settings in the bios and i keep having the same results, this tells me my memory is not the problem (i am getting rid of these and getting 2x2gb sticks tommorow anyway just to be safe) so any other ideas what could be causing this?
  8. Be sure to pick up a 2x2 kit that runs at the standard 1.8v so you don't run into the same type of problem.

    G.SKILL HK 4GB (2 x 2GB) 240-Pin DDR2 SDRAM DDR2 800 (PC2 6400) Dual Channel Kit Desktop Memory - Retail $40.99


    G.SKILL PI Black 4GB (2 x 2GB) 240-Pin DDR2 SDRAM DDR2 800 (PC2 6400) Dual Channel Kit Desktop Memory - Retail $49.99
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