OC advice for the following system (e8500, evga 780i, corsaid 1066)

foobee

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May 18, 2008
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CPU: E8500
Mem: (4GB) 2x2GB Corsair DDR2 1066: 5-5-5-18 at 800 MHz / 5-5-5-15-2T at 2.1v 1066 MHz
EVGA 780i MB

If I wanted to OC to 3.6 with stock CPU voltage, do I need to lower the mulitplier on the E8500 is to 9 and up the FSB to 400 (or do I need to keep the stock E8500 multiplier at 9.5 and up the FSB to ~380?)

If I OC to 3.6, what do I need to set my memory to? Can I set it to the manufacturer spec of 5-5-5-15-2T at 2.1v 1066 MHz?

Thanks
 

Lupiron

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Feb 9, 2008
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You may encounter a problem with OCing at stock voltages due to the MASSIVE VDrop and VDroop of the 780i chipset. I recommend you first discover your VDrop and VDroop values before you OC. If they are the usual huge amount, you may be wise to add a lil VCore just for the stability of it!

Just boot into windows at stock settings, Run Core Temp and note the VID of your chip. Then re boot and select that in the Bios, remembering what it was! Then boot into windows and run CPUz and note the new Core voltage Value in there. The difference from your inital BIOS VID setting is VDrop. Then run Prime 95 smapp FFTs on all cores, and wait 1 min, then note the now decreased VCore value.

Those boards get damn close to a .1 VDrop/VDroop combo! .0750 is common! Once yopu know if its alot or a little, you can then decide if you may wanna up the VCore voltage a notch or two in the Bios from its VID factory setting.

FSB 400 x 9 is yer 3.6 alright, that will allow you to sync your RAM at 800 Mhz. (You can use a divider to get 1066, but it really doesnt do much at all. Maybe go for 4-4-4-12 @ 800 Mhz?)

--Lupi