Ram Refuses To Run At 1066mhz

Gigabyte / Ga-ma790gp-ds4h
August 21, 2014 at 05:51:41
Specs: Windows 7, AMD Phenom II X4 960T@4018 MHz/OCZ 4GB (2x2GB) DDR2 800MHz/PC2-8500
not to sure were to post this as my systems overclocked. but iv just tried with everything at default settings and getting the same issue.
to start with when i stated to overclock nothing worked..cores cutting out/bscod.i then set my ram back to 800mhz and everything dropped into place. no crashs. and managed to get a nice overclock. stressed for 4 hours with prime95. but refuses to run at 1066mhz. iv set my timings and voltage to...5-6-6-18 Voltage2.1 as the manufacturer says but no joy.
as i said it happens with everything running on default.nothing overclocked.

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#1
August 21, 2014 at 12:22:07
Please list your complete system specs.

"OCZ 4GB (2x2GB) DDR2 800MHz"

Do you have DDR2-800? If you do & the manufacturer specs the voltage at 2.1v, it's probably not true DDR2-800. True DDR2-800 runs at 1.8v. That would mean your RAM is factory overclocked/overvolted DDR2-667 so it's unlikely it will run as DDR2-1066 (533MHz frequency).

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#2
August 21, 2014 at 13:27:21
http://www.newegg.com/Product/Produ...

1.8v=800mhz

Or

2.1 v/2.15 evp=1066mhz

Iv always run it at 1066mhz and seemed ok. But pc blue screens and restarts stressing with prim95. Works % 100 at 800mhz. Just a little annoying.

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#3
August 21, 2014 at 20:26:28
First, you should have OC first with the RAM at stock to confirm stability, then increased the RAM and retested.
Second If the RAM is intended to run this way, it should have a built in XMP setting, if your BIOS supports this, you should set it this way to get it to run as intended. If it does not support it or your MB BIOS does not support it, you need to understand that most RAM that runs this way uses 'looser' timings when run at the higher settings. Try increasing from 5-6-6-18 to 6-7-7-20 and seeing if it runs, if it does, try tightening up one at a time to see if it still runs. When you hit the one that does not run, try upping the volt by +0.1V to see if it will run. If not, then back off on the timing and the voltage and try any remaining timing to see how they run. The approach to Overclocking needs to be systematic and takes time to get the best settings for your system. Always monitor all temperatures and stress test to a reasonable degree to find the best for everyday use and understand that the highest settings are not always suitable for everyday use, especially if the system or component runs too hot. If the memory will not run at the higher setting, you can either try tighter settings at the stock speed to maximize the memory or return and purchase a different set of memory.
These are general recommendations based on the info you have supplied. For more specific advice, post all of your specs/components as riider has asked.

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#4
August 22, 2014 at 06:04:31
i have no XMP setting in the bios.i will try your suggestions when i have time.hears my full system spec.thank you.

Motherboard Gigabyte.. GA-MA790GP-DS4H
CPU.. AMD Phenom II X4 Black Edition 960T
memory.. OCZ 4GB (2x2GB) DDR2 800MHz/PC2-8500 Gold Memory
graphics card.. Sapphire Radeon HD 7790
cpu cooler..OCZ Vendetta
psu.. Corsair 650W TX Series

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