RAM Speed Problems

G

goooooller

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Apr 27, 2009
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My motherboard is AM2+ socket, my processor is AM2+ socket. They are both labeled as supporting pc8500 (DDR2 1066mhz) RAM. I went out and bought pc8500 ram expecting it to run at that speed. But once everything was installed the ram clocks in at 800mhz which is not as advertised.

What can I do to get my RAM to operate at 1066mhz? Do I need to update the BIOS, or just simply change the voltage/clockspeed?


MSI K9N2 SLI Platinum
AMD Athlon 64 X2 7750 AM2+ (oc to 3ghz)
4 gigs pc8500
GeForce 9800 GTX+
 
You need to go into your BIOS and set FSB:DRAM ratio so that the speed is 1066 MHz. I'm not sure exactly where it would be in your BIOS. Look at your owners manual or just explore around and you should find it fairly easily.

msi_k9n2-diamond_cell-menu.png


Something like this.
 
Last edited:
Yeah, what he said. I don't own a AMD rig, but I read somewhere that only one channel will run the full 1066. You won't really notice the change in speed without overclocking the processor. In situations like this, it's all about who is the weakest link.
 
well it worked i guess. in cpuz the ram speed is 533.x but each stick is still measured at pc6400. shrug kind of sucks when things say youll get pc8500 but it only shows up and performs as pc6400 out of box
 
It shows up at DDR2 800MHZ because you don't have a quad core processor thats why, amd dual core processors don't have the instructions to do DDR2 1066 only there quad cores do. If you upgraded to a quad core, you would probably get that speed, but if you have a dual core you will only get speed rated at DDR2 800MHZ, I knew this when i bought my DDR2 1066 and am just trying to figure out how to increase the speed to 1066 by over clocking. Even when you OC it, it will not show up as DDR2 1066 it will show up as DDR2 800 with better timings and speed then it should have.
 
its based on the motherboard AND cpu
also pc6400 doesnt neccasarily mean that it will be 1066MHz

most speeds can be ound using cpuz but its not 100% guaranteeable.
 
It doesnt matter what your motherboard says, thats for advertising... What does the box of Ram say it runs at? If it says 1066, then its a Bios issue. If not, then you just bought 800mhz ram. If it should run at 1066, its currently underclocked, and is running at the same specs your old ram was (assuming it was 800mhz). Look at your box, look for the voltages, clocks, and latencies. Now turn your computer off, on, hit 'Del', and go into Bios, then look for something that says Clocks/Voltages. In that menu, there should be a few options, look for the one about RAM, and apply the new settings.
 
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