PC2-6400 shown as PC2-4300

[denis54]

I have overclocked E4300 C2D fom 1.8 to 3.0 Ghz. All I did was change the FSB on my MB (P5B-Plus) from 800 to 1333. I did not change anything else My system has been 100% stable for several days.

 

When I boot my BIOS identifies my PC2-6400 memory as PC2-4300. Is that a problem? Is my computer slower because of this? Should I change something in my settings?

 

I do not know much about BIOS settings.

 

My memory modules are 2 X 1 GB CM2X 1024-6400 C4 4-4-4-12.

[Synthohol]

post a screenshot of cpu-z the mem tab and the spd tab.

its likely it dropped to the lower frequency so you can get the higher bus speed without making your ram mad. those screenshots will tell all :)

[denis54]

Here are CPU-Z results:

[vinark]

Yes you will have to set your memory to the specs in the bios.So 800mhz and 4 4 4 12 timing and 2.1V. It will be a lot faster with memory intensive processes-

[denis54]

Based on overclocking information I found on the internet I set DRAM Frequency to DDR2-667. The other possible options I have are DDR2-833, DDR2-1000, DDR2-1111, DDR2-1333.

 

DDR2-800 is not an available option.

 

I read that I should not set DRAM Frequency above 667 so that is why I choose that speed.

 

When I boot my BIOS still identifies my memory as being PC2-4300

 

I changed the North Bridge settings to 4 4 4 12 .

 

I also adjusted Memory voltage to 2.1V

 

What should I do next?

 

My motherboard is an ASUS P5B-Plus with an AMI BIOS.

 

Other than what I found on Google today, I know essentially nothing about memory settings.

 

Here are my new CPU-Z results:

[vinark]

Just try 833. I have that on my overclocked systems too. No problems here. As long as you don´t set the voltage higher then 2.1V there are no risks. Only use 667 if 833 is not stable.

[denis54]

I changed my DRAM Frequency to DDR2-833 as you suggested.

 

CPUZ-Z now reports DRAM Frequency at 416.0 and FSB:DRAM at 4:5

 

All other CPU-Z values have remained the same.

 

My BIOS now shows DDR2-5300.

[vinark]

That´s great! No issues?

The bios is reporting ram speed as if you didn´t overclock the FSB. that´s why it is reporting 5300.

 

If you want to you can run a ram benchmark like sisoft sandra, but AFAICS it is looking good now.

[denis54]

No issues at all. My system is rock stable.

 

However, I still wonder why it says PC2-5300 instead of PC2-6400.

[vinark]

As I said the bios reports the non overclocked fsb ram speed, that´s all and no issue, just an unimportant bios programming error.

[Synthohol]

ok, your CPU is 800Mhz @ 1.8G stock. you have overclocked to 3.0Gz a difference of 1.2G.

 

my suggestion is to write down all your custom voltages and reset the BIOS to stock and see if DDR800 is the 1:1 option. then up the CPU frequency by like 25 and see what speed your ram boots at. it should move up evenly with the CPU. gradually increase the CPU speed until you see the ram drop to a lower frequency (if it does) some boards do this. at that point you may need to try ddr1000 but should report at a lower speed like 920 once your CPU is back to 3.0G.

or you can just leave it where it is:): i like to tinker so thats where im coming from.