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Overclocking core i5 to support memory

post #1 of 11
Thread Starter 
My setup:

Motherboard: MSI P55-GD65 LGA 1156 Intel P55 ATX Intel Motherboard
Memory: G.SKILL Trident 4GB (2 x 2GB) 240-Pin DDR3 SDRAM DDR3 2000 (PC3 16000) Desktop Memory Model F3-16000CL9D-4GBTD
CPU: Intel Core i5-750 Lynnfield 2.66GHz 8MB L3 Cache LGA 1156 95W Quad-Core

My memory cannot run at 2000mhz unless the CPU is overclocked to support it. I've posted in several other forums and received answers, but every time I do what people say my computer gets caught in a reboot cycle. Here's what I'm doing:

1) Change CPU timings from 133 to 200.
2) Activate XMP profile (motherboard feature which, supposedly, runs the RAM at its optimal settings, there doesn't seem to be a difference between what the XMP does and what I would manually set the timings to anyway).
3) Change VTT to 1.4

And that's when the reboot cycle starts. Any help?

(right now the CPU is stock cooled, but I have a Hyper 212 coming in this week)
post #2 of 11
Your CPU probably cannot handle a 50% overclock on the stock cooler. Considering lowering your RAM frequency as well as the timings (to make up for it) until your HSF arrives.
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Leviathan
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post #3 of 11
Can't you downclock your ram?
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post #4 of 11
You realized 200 BCLK x 20 CPU Multiplier is 4GHz right? So you'll most likely need to change the CPU Voltage as well.
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post #5 of 11
Thread Starter 
I don't plan on doing any permanent overclocking until my fan arrives, but I still need to make sure my settings work when it does.

What should I change my CPU voltage to?
post #6 of 11
You probably won't be able to divine any useful information by overclocking with a different HSF. Your settings will differ wildly when you replace it. Just downclock your RAM and lower the timings. You don't see much performance increase past 1600MHz, although you do with lowered timings.
Leviathan
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64GB SSD boot + Raid 10 WDC Blues Pirated Win 7 (duh) Alienware AW2310 Corsair AX1200 
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Leviathan
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Hard DriveOSMonitorPower
64GB SSD boot + Raid 10 WDC Blues Pirated Win 7 (duh) Alienware AW2310 Corsair AX1200 
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CoolingOSPowerAudio
Corsair H50 ESXi 6.0RC Corsair HX1000 Focusrite Scarlett 18i20 
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CPUMotherboardGraphicsRAM
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post #7 of 11
Thread Starter 
It already is downclocked. That's the opposite of what I want.
post #8 of 11
What's the point? You won't see the extra bandwidth at work on an LGA 1156 chipset/CPU and you obviously have NO IDEA what you're doing or how overclocking works.
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post #9 of 11
4GHz would probably require around ~1.45v from my experience. I still highly recommend waiting for your HSF. You're not going to be able to properly test your components with the stock fan. If you're determined to overclock early, shoot for a 3.2GHz clock that will leave your RAM at 1600MHz. Then drop timings and proceed to stress test.
Leviathan
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Workstation
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Alexandria
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CPUMotherboardGraphicsRAM
i7 980X @ 4.3 HT on Asus P6T Deluxe V2 Radeon 5970 + GT 240 PHYSX Corsair 12gb (horrible) 
Hard DriveOSMonitorPower
64GB SSD boot + Raid 10 WDC Blues Pirated Win 7 (duh) Alienware AW2310 Corsair AX1200 
Case
Antec 902 Modded 
CPUMotherboardRAMHard Drive
Xeon E3-1265L V2 Asus P8C WS Kingston 32GB 1600MHz ECC Crucial M4 256GB 
CoolingOSPowerAudio
Corsair H50 ESXi 6.0RC Corsair HX1000 Focusrite Scarlett 18i20 
Other
Mellanox MNPA19-XTR 
CPUMotherboardGraphicsRAM
Dual Intel Xeon L5630 Supermicro X8DTH-6F Radeon 7750 64GB 1066MHz Registered DDR3 
Hard DriveHard DriveCoolingOS
4 x 4TB Hitachi SAS Ultrastar Crucial M4 256GB Dual NH-U9DX i4 vSphere 6.0RC 
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Leviathan
(13 items)
 
Workstation
(10 items)
 
Alexandria
(11 items)
 
CPUMotherboardGraphicsRAM
i7 980X @ 4.3 HT on Asus P6T Deluxe V2 Radeon 5970 + GT 240 PHYSX Corsair 12gb (horrible) 
Hard DriveOSMonitorPower
64GB SSD boot + Raid 10 WDC Blues Pirated Win 7 (duh) Alienware AW2310 Corsair AX1200 
Case
Antec 902 Modded 
CPUMotherboardRAMHard Drive
Xeon E3-1265L V2 Asus P8C WS Kingston 32GB 1600MHz ECC Crucial M4 256GB 
CoolingOSPowerAudio
Corsair H50 ESXi 6.0RC Corsair HX1000 Focusrite Scarlett 18i20 
Other
Mellanox MNPA19-XTR 
CPUMotherboardGraphicsRAM
Dual Intel Xeon L5630 Supermicro X8DTH-6F Radeon 7750 64GB 1066MHz Registered DDR3 
Hard DriveHard DriveCoolingOS
4 x 4TB Hitachi SAS Ultrastar Crucial M4 256GB Dual NH-U9DX i4 vSphere 6.0RC 
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post #10 of 11
Quote:
Originally Posted by mymlan View Post
4GHz would probably require around ~1.45v from my experience. I still highly recommend waiting for your HSF. You're not going to be able to properly test your components with the stock fan. If you're determined to overclock early, shoot for a 3.2GHz clock that will leave your RAM at 1600MHz. Then drop timings and proceed to stress test.
this. Dont forget at those ram speeds you are almost surely to need more qpi/vtt voltage as well.

i strongly suggest you read a basic lynnfield overclocking guide before proceeding. Search these forums im sure there has been tons of them made.

But like mylan said, start of small and work your way up. These lynnfield chips arent like sandy bridge. You cant hit 4ghz right out of the box with no effort. Lynnfield overclocking actually takes time and lots of fine tuning.
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My System
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c300, 2X WD CAVAIAR BLACK 640GB RAID 0 LG Bluray/Dvd Rewriter 7 Ult Gateway 24" lcd 1920x1200 
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