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Question about the E8400 Wolfdale overclocking options availability

post #1 of 4
Thread Starter 
Greetings. i had a question about the Intel Core 2 Duo E8400 Wolfdale 3.0GHz 6MB L2 Cache LGA 775 65W Dual-Core Processor and its overclocking capabilities.

I know that in order to overclock an intel cpu, you have to increase the Bus Speed and choose your Clock Ratio and also finally choose your System Memory Multiplier which determines how fast the memory runs.

for example, right now i have a Pentium 4 cedar mill overclocked to 4.5 ghz, and my corsair xms2 series ram running at thier maximum of 800 mhz. My motherboard, a GIGABYTE ga-g31m-s2l supports to the maximum an 800 mhz RAM situation, although it also claims to support a 1333 mhz FSB? i thought that was the speed at which the processor communicates with the RAM, why would a motherboard support a faster FSB frequency than the RAM frequency?

here is what i am using in the BIOS:

Clock Ratio: 15x
Bus Speed: 300 Mhz
System Memory Multiplier: 2.66 (availabe options are 2.66, 3.33, or 4)


now, i would love to push the E8400 over 4.0 ghz like so many others have done but i need to know the Clock Ratio, Bus Speed and System Memory Multiplier options that are available with the E8400. My motherboard says in its manual that the System Memory Multiplier options available are dependent on the CPU FSB settings, so if i put another CPU in the socket will the available options change? or is that not true and the 2.66,3.33,4 options only what im going to get?

would the following situation be possible with the E8400 and my GIGABYTE ga-g31m-s2l motherboard:

Clock Ratio: 8
bus speed: 500
System Memory Multiplier: 1.6

thus giving both cores a frequency of 4 ghz? what are the available options that are shipped with the E8400? i should note, if i ever try to push the ram over 800 mhz then i get almost an instant crash at the windows xp desktop. also, what would happen if my Rated FSB were to go over 1333? would my computer also crash because my motherboard can only go as high as a 1333 FSB? i have seen alot of success stories of people overclocking with the bus of the E8400 into the 450 MHZ range, so surely if it is quad pumped that would be a FSB of 1800 MHZ... i have not seen motherboard go that high, or maybe it doesnt matter as much?

i guess my biggest problem is the System Memory Multiplier because i cant go over 800 mhz for the RAM, although i think its my motherboard that is picky about that, not the RAM itself.
post #2 of 4
Alright, I will try my best to answer this for you.

To start off, I would go about buying some new RAM. Hitting over 4ghz stable without good RAM is very hard. I had to buy new RAM to hit 4.2 stable. Also, run at a 9x multiplier and it keeps the FSB lower, ( Think it is around 450) allowing for a higher OC with lower FSB (if the motherboard can't take high FSB). If your FSB goes above 1333 it will not crash considering the motherboard is good for overclocking. That number is not the maximum the board will go to. My motherboard says the same thing (rated for 1333) and I hit 1800 easily. For system memory multiplier, I think that is determined by your motherboard. Mine has a bunch like 5:4, 3:2, auto ( i just leave it on auto)

I am not too sure how well that MoBo overclocks. I have no experience with Gigabyte motherboard.

I tried my best I hope it helps a bit.


*edit* Welcome to OCN though! Fill in your system specs in the control pannel!
Planet Express
(13 items)
 
  
CPUMotherboardGraphicsRAM
i5 2500k Asus P8Z68-V Pro Zotac GTX 570 Mushkin Blackline DDR3-1600 8GB 
Hard DriveOSMonitorKeyboard
SSD: Intel 40gb + Kingston 64gb Windows 7 64 bit Samsung SyncMaster 24" 245BW Saitek Eclipse II 
PowerCaseMouse
Corsair TX750W Cooler Master HAF Razer Deathadder 
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Planet Express
(13 items)
 
  
CPUMotherboardGraphicsRAM
i5 2500k Asus P8Z68-V Pro Zotac GTX 570 Mushkin Blackline DDR3-1600 8GB 
Hard DriveOSMonitorKeyboard
SSD: Intel 40gb + Kingston 64gb Windows 7 64 bit Samsung SyncMaster 24" 245BW Saitek Eclipse II 
PowerCaseMouse
Corsair TX750W Cooler Master HAF Razer Deathadder 
  hide details  
Reply
post #3 of 4
Thread Starter 
SugarySnack - thank you for answering my question, i also think that the system memory multiplier is determined by the motherboard and not neccessarily by the CPU like the manual says it does. i heard from somewhere else that the lowest the SPD will go on gigabyte motherboards, or at least mine, is 2.0, which means the fastest i can get the E8400 to go is 3600 mhz using this formula:

9 clock ratio x 400 bus = 3600 mhz clock speed.


with a SPD of 2 to get 800 mhz ram speed. it seems i will be unable to push the e8400 over 4 ghz with my motherboard... thank you for taking the time to talk to me though!
post #4 of 4
could anyone tell me how to change vocre on a wolfdale 1333
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