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i7 overclock memory speed question

post #1 of 6
Thread Starter 
Okay this is bothering me a bit so here it is. i overclocked my i7 930 d0 to 4.03ghz (21x 192) prime and ibt stable for 6 hours okay good. but here is the thing..

My memory corsair xms3 is rated at 1333mhz 9-9-9-24. but in my motherboard bios i can only choose 1150mhz or 15...something (cant remember) i tried 15XX mhz but its not stable i did pretty much everything i could but its just to much for my ram. but 1150 is pretty much a down clocked ram right? so how can i get this fixed to get it around 1333mhz?

maybe I'm just confused or something and I'm making a huge mistake, i don't know. so any advice is more than welcome
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Blackbird
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post #2 of 6
You can't get the ram to 1333MHz with your overclock, since increasing the BCLK increases the ram frequency.

The best you can do is either run the memory at 1150MHz with tighter timings e.g. 7-8-7-20 or 6-7-6-20. Or run it at 15xxMHz but loosen the timings e.g 11-10-11-27

But you can not get the ram to 1333MHz with the CPU overclocked unless you only increase the multiplier. The moment you increase the BCLK, the RAM frequency will also increase.
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post #3 of 6
Thread Starter 
Quote:
Originally Posted by Vengeance47 View Post
You can't get the ram to 1333MHz with your overclock, since increasing the BCLK increases the ram frequency.

The best you can do is either run the memory at 1150MHz with tighter timings e.g. 7-8-7-20 or 6-7-6-20. Or run it at 15xxMHz but loosen the timings e.g 11-10-11-27

But you can not get the ram to 1333MHz with the CPU overclocked unless you only increase the multiplier. The moment you increase the BCLK, the RAM frequency will also increase.
Aaah okay i get , would it be a performance hit @ 1150 with tighter timings, or should i just get a triple channel set @ 1600mhz?
Blackbird
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Blackbird
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post #4 of 6
1600MHz is always better for overclocking, since you have more room to play around (ie. the lowest RAM multi will have you around 1333MHz on a 4GHz OC with nice tight timings)

But in terms of real world difference, running the memory @ 1150MHz with tight timings will probably be more beneficial than upgrading to 1600MHz ram. But if you are benchmarking (which with a 4.0GHz OC I doubt you are) than the 1600MHz upgrade would be worth it.

But you are probably better off keeping your current kit and running it at either 1150MHz with maybe....7-6-7-20 2T timings or 15xx MHz at 10-10-10-27 than buying new memory.
Current Rig
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CPUMotherboardGraphicsRAM
i5 2500k MSI Z77A-GD65 Sapphire RX 480 Nitro+ OC G.Skill Ripjaw X 2133MHz 
Hard DriveCoolingOSPower
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Current Rig
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i5 2500k MSI Z77A-GD65 Sapphire RX 480 Nitro+ OC G.Skill Ripjaw X 2133MHz 
Hard DriveCoolingOSPower
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Corsair 200R 
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post #5 of 6
Thread Starter 
Quote:
Originally Posted by Vengeance47 View Post
1600MHz is always better for overclocking, since you have more room to play around (ie. the lowest RAM multi will have you around 1333MHz on a 4GHz OC with nice tight timings)

But in terms of real world difference, running the memory @ 1150MHz with tight timings will probably be more beneficial than upgrading to 1600MHz ram. But if you are benchmarking (which with a 4.0GHz OC I doubt you are) than the 1600MHz upgrade would be worth it.

But you are probably better off keeping your current kit and running it at either 1150MHz with maybe....7-6-7-20 2T timings or 15xx MHz at 10-10-10-27 than buying new memory.
Thanks for clearing things up. +1 rep.
Blackbird
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Blackbird
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CPUMotherboardGraphicsRAM
i7 930 D0 @ 3.80 GHZ/w HT ON 1.225V Asus Sabertooth X58 MSI 7950 Twin frozen 3GB 6x2GB Corsair Dominator 1600mhz 8-8-8-24-1t 
Hard DriveHard DriveCoolingOS
2x Samsung HDLJ 500gb 1x Samsung HDLJ 750GB OCZ Vertex 4 SSD 128GB Custom Water Windows 7 Ultimate x64 
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post #6 of 6
Quote:
Originally Posted by Blackbirdx58 View Post
Aaah okay i get , would it be a performance hit @ 1150 with tighter timings, or should i just get a triple channel set @ 1600mhz?
if you load the XMP profiles then there's an issue where the profile will set higher voltage for VTT..
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