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Trying to OC Corsair XMS3, need a little help...

post #1 of 10
Thread Starter 
Fairly new to overclocking and need a little direction here...

I just recently purchased 8GB Corsair XMS3. I'm currently running a Core 2 Duo E8400 and an MSI P43-C51 motherboard. I have the proc OCed to 3.6GHz by upping the FSB to 400MHz. If I try to switch the FSBRAM ratio from Auto to 1:2 to run the RAM at 1600MHz the system won't boot. Do I need to increase the voltage as well?

Thanks in advance for any help provided!
post #2 of 10
Yes, make sure the ram voltage is not set to auto in the bios. I believe (could be wrong so verify) that the XMS3s call for 1.65v. What ever corsair calls for, set it to that manually in the bios. You may even have to go slightly over 1.65. I set mine to 1.67v and it shows 1.65v in cpu-z. Your mobo will never set it that high on auto and that could very well be why your OC is failing.
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Black Water
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post #3 of 10
Thread Starter 
Going to give it a try now, thank you!
post #4 of 10
What motherboard are you using as well? The core2 series intels max out at 1066 and 1333 FSB, anything above that may be pretty trickey to get to. The sticks are rated for 1600 but if your board wont go that high then there just going to underclock themselves down to the rated speed of the MOBO your using.
XaphanII
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XaphanII
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post #5 of 10
Thread Starter 
I'm using an MSI P43-C51, The Core 2 by itself will go up to 3.6GHz by upping the bus speed to 400MHz. FSB hovers right around 1599.9 in CPU-Z:



When set to auto, the FSB: DRAM ratio defaults to 1:1.33 leaving the RAM underclocked. I've tried setting the DRAM Voltage from Auto to 1.65 and 1.67 but in CPU-Z it still appears to stay at 1.6:



The highest setting I can set the ratio to is 1:1.60, giving me 1280, still underclocked. When I set it to 1:2 it fails to boot. Am I missing something when adjusting the RAM voltage since it doesn't appear to be changing in CPU-Z?
post #6 of 10
I dont think voltage is the issue, those sticks should run at 1600 with no extra voltage, You could try manually setting them to run at 1600 in your BIOS rather then relying on the FSBRAM divider. setting it at 1:1 might be a little too much for your board. I had a P5q running at 1600 FSB but I was unable to get my ram any higher then 1400 or so, so I left it underclocked and chose to tighten the timings instead. though intel systems gain more from higher clock speeds then timings when it comes to memory..or so I've read =)
XaphanII
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XaphanII
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Intel 530 series 120GB SSD. WD Black 1Tb x 2 Seagate barracuda 2Tb Swiftech H220 
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CaseMouseMouse PadAudio
Corsair Graphite 600t Razer Deathadder Razer Vespula Logitech Z5500's + integrated home audio. 
CPUMotherboardGraphicsRAM
Phenom II x 4 965 BE @ 3.8 1.42v Crosshair III Formula NB @ 2700 mhz HD 5770 Vapor-x Corsair XMS 3 4GB 1600 MHZ 
Hard DriveOptical DriveCoolingOS
Intel X-25 40 Gig SSD(OS) 2x1TB WD Black in Raid-0 LG Multi Dvd-R Cooler Master V8 Windows 7 Ultimate 
MonitorKeyboardPowerCase
21.5" Samsung 2243SWX + 19" sony CRT dualview Razer Lycosa Corsair TX 750W Cooler Master CM 690 II Advance 
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post #7 of 10
Thread Starter 
I don't think the AMI BIOS will let me manually set the DRAM frequency to 1600, it looks like the only way I can change it is via the ratio, which has preset values in it. Highest it will go is 1:1.6, next value is 1:2. Motherboard says it supports 1600MHz OCed so you would think it should work. The RAM voltage says 1.5-1.65 but where does CPU-Z tell me what the RAM voltage currently is?
post #8 of 10
Thread Starter 
Maybe I'll just have to live with them running at 1280 if I have the CPU at 3.6. I haven't tried playing around with the Extreme Memory Profiles in the BIOS so maybe I will give that a try...
post #9 of 10
CPUZ wont show the RAM voltage, have to check that through BIOS =/ it only gives suggested voltage levels depending on the frequencies your running at.
XaphanII
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Core i7 4770k Asus Maximus Vi Formula Gigabyte GTX 770 Windforce (Second one coming s...  8Gb G-Skill Trident-X 2400 Mhz 
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Intel 530 series 120GB SSD. WD Black 1Tb x 2 Seagate barracuda 2Tb Swiftech H220 
OSMonitorKeyboardPower
Windows 7 Home Premium Samsung 32" HD Tv Logitech G11 Corsair HX 750 
CaseMouseMouse PadAudio
Corsair Graphite 600t Razer Deathadder Razer Vespula Logitech Z5500's + integrated home audio. 
CPUMotherboardGraphicsRAM
Phenom II x 4 965 BE @ 3.8 1.42v Crosshair III Formula NB @ 2700 mhz HD 5770 Vapor-x Corsair XMS 3 4GB 1600 MHZ 
Hard DriveOptical DriveCoolingOS
Intel X-25 40 Gig SSD(OS) 2x1TB WD Black in Raid-0 LG Multi Dvd-R Cooler Master V8 Windows 7 Ultimate 
MonitorKeyboardPowerCase
21.5" Samsung 2243SWX + 19" sony CRT dualview Razer Lycosa Corsair TX 750W Cooler Master CM 690 II Advance 
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XaphanII
(16 items)
 
   
CPUMotherboardGraphicsRAM
Core i7 4770k Asus Maximus Vi Formula Gigabyte GTX 770 Windforce (Second one coming s...  8Gb G-Skill Trident-X 2400 Mhz 
Hard DriveHard DriveHard DriveCooling
Intel 530 series 120GB SSD. WD Black 1Tb x 2 Seagate barracuda 2Tb Swiftech H220 
OSMonitorKeyboardPower
Windows 7 Home Premium Samsung 32" HD Tv Logitech G11 Corsair HX 750 
CaseMouseMouse PadAudio
Corsair Graphite 600t Razer Deathadder Razer Vespula Logitech Z5500's + integrated home audio. 
CPUMotherboardGraphicsRAM
Phenom II x 4 965 BE @ 3.8 1.42v Crosshair III Formula NB @ 2700 mhz HD 5770 Vapor-x Corsair XMS 3 4GB 1600 MHZ 
Hard DriveOptical DriveCoolingOS
Intel X-25 40 Gig SSD(OS) 2x1TB WD Black in Raid-0 LG Multi Dvd-R Cooler Master V8 Windows 7 Ultimate 
MonitorKeyboardPowerCase
21.5" Samsung 2243SWX + 19" sony CRT dualview Razer Lycosa Corsair TX 750W Cooler Master CM 690 II Advance 
MouseMouse PadAudio
Razer Deathadder Razer Vespula Logitech Z5500 / Steelseries Sibera V2 
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post #10 of 10
Thread Starter 
Roger that. I might try enabling XMP, see if I can get anything different out of it. If not, I will just tighten up the timings a little bit.

Thanks for the help! +Rep for both of you!
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