BIOS unable to optimize RAM speed to it specification

Corsair Vengeance 8gb pc3-12800 1600mhz...
May 9, 2013 at 12:05:48
Specs: Windows 8, Core i7 3770 / 4GBx2 DDR3 Vengeance
I am unable to set my RAM speed from 1333 to 1600. As my ram supports 1600 i should be able to, but when i set my ram speed to 1600 from the BIOS, my pc doesnt restart gives and error "windows could not start because ......... this may be due to change in the performance option of the bios." an error something close to this and when i reset it back to 1333 it boots properly. I have tested my ram with Memtest by booting it from .iso and it tested OK with no error. Please help me out as i need to run my PC with optimized settings.
I have recently updated my BIOS to Intlel's "KCH7710H.86A.0108.EB.WINPE64" which has an user friendly UI.

I am running:
Core i7 3770 3.4GHz,
Intel DH77KC,
Corsair 4GBx2 vengeance ddr3 1600,
Corsair GS600.


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#1
May 9, 2013 at 15:15:08
So the ram supports the higher speed, but what about the motherboard, what is Front side bus capability of the motherboard, what is max ram speed it says it can handle? The board and ram both have to be capable of the same speed or it gets dumbed down to a common speed.

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#2
May 9, 2013 at 15:17:49
If your board supports the higher speed, but windows believes it is a significant hardware change then you may have to boot to the windows disk i nand do a "Startup repair" of the operating system after bumping up the speed.

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#3
May 9, 2013 at 15:23:51
Many times manufacturers fudge the specs for RAM. You also may need to boost the voltage or loosen the timings.

One other item to note. If you have mixed RAM installed in the system the slowest RAM will determine how fast all the RAM can run.

According to Intel the board supports 1600.
http://ark.intel.com/products/59506/

Is the link below your RAM? If so, are you using those settings?
http://www.newegg.com/Product/Produ...


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Related Solutions

#4
May 9, 2013 at 19:54:22
It says that it supports DDR3 1600 as long as you are using 3rd generation i-series CPU, which you are:
http://www.intel.com/content/www/us...
Have you tried activating XMP memory settings for DDR3 1600MHz?
Does your memory require more voltage at 1600 than at 1333 if you cannot activate XMP memory settings? It may work at 1333 at stock 1.5Volt but require 1.65Volt at 1600MHz. Also, typically XMP settings for 1600MHz use 'looser' memory timings than the memory would normally use if set to stock 1333 so if you cannot use XMP settings, look at Corsair site or Google for optional timings, but typically the settings are +1 for each of the lower numbers so instead of 9-9-9-24 try 10-10-10-30 and see if that works.

You have to be a little bit crazy to keep you from going insane.


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#5
May 9, 2013 at 21:22:25
Thanks HopperRox, my motherboard supports 1600 and i also did a system repair after i bumped up the speed ut still no luck coudmt get the pc to start.

@OtheHill i do not have mixed RAM installed both are 4gig vengeance. And No thats not my RAM, this is my ram, http://www.newegg.com/Product/Produ...

@ Fingers No i have not tried activating XMP memory, i do not even know what is that.


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#6
May 9, 2013 at 21:42:52
You did not buy matched modules. The link I provided is for matched modules, which you should use when running RAM in dual memory mode. That may be the reason why you can't run at specked speed.


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#7
May 10, 2013 at 04:55:08
XMP = Extreme Memory Profile = Access to stored advanced memory configuration for non-standard memory configurations. These configurations are stored on the memory and accessible when you activate the XMP in your BIOS. It can be called Advanced Memory Profiles or JDEC #1, JDEC #2, etc. Once you activate it or choose one of the available profiles, all memory settings are configured for you for these 'non-standard' settings and you can get the full advertized speed of these high performance memories without manually resetting them (like 'official' non-official memory overclocking settings). They are 'outside' the official specs for the DDR3 memory for those motherboard/BIOS/Memory Controller combinations, but they are 'officially' outside of them (if that makes sense) so the XMP profiles need to be activated to use them.

You have to be a little bit crazy to keep you from going insane.


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#8
May 10, 2013 at 05:06:27
@Fingers, it sounds good. So now how do i activate XMP??? Actually i did get 3 profile option in Performance --> Memory --> 1. Auto 2. 1333 3. 1600. When i select the 1600 profile it automatically goes back to 1333 and turns the text colours of its spec on the screen red.

@ OtheHill, i guess i did buy the same two 4gig ram. Everything looks same and the packaging and info was also the same.


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#9
May 10, 2013 at 06:31:40
The modules may have come from different batches which can have slightly different characteristics. Manufacturers bundle 2, 3, or 4 modules that have been matched for that reason.

Hopefully you will be able to get the RAM running at the specified clock speed.


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#10
May 10, 2013 at 09:35:55
That should be the setting, if it does not let you, try shutting down and swapping the memory in the slots. Some motherboards go by the memory in the first slot for its settings and if they are different enough, one may not run at the others settings. Also look at the labels on the memory and see that they have the same detailed specs, memory with the same speed ratings may be set to run at different latencies due to batch or quality control. As mentioned, purchasing memory in matched pairs is important. If switching them does not work, it is possible to play with the memory settings manually, but you may consider the possibility of returning both of them and purchasing a matched pair.
I am running four sticks from two matched pairs, but I researched the memory's details before purchasing the second pair so I could still run them at their max specs together. Even then, CPUz shows that one pair has 3 possible settings and the other pair has 4 possible settings (one a true overclock setting), but they all run at the same setting which was important to me then and now without having to experiment with the manual settings to get them to work together.
Also note that on many motherboards with four slots, dual channel memory does not always go into neighboring slots, many use slot 1 & 3 as a pair and 2 & 4 as a pair so make sure that they are on the same channel (pair).

You have to be a little bit crazy to keep you from going insane.


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#11
May 10, 2013 at 09:57:45
@ Fingers, Thanks a ton i will just go and try it out.

@ OtheHill, I will have to check both the sticks and surely will post it after i have all the info.


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