Problem with CPU clock freq / RAM underclocked

  Samuelson 18:58 22 Mar 06
Locked

I have the following board, CPU and RAM:

Gigabyte GA-K8N Ultra-SLI
Athlon 64 4000+ San Diego
Crucial PC3200 2 x 1GB Dual Channel

I have noticed that the RAM is reported to be running at 200Mhz clock speed, as is the CPU clock frequency (with x12 multiplier = 2.4GHz)

PC3200 RAM should have a clock speed of 400MHz, as should the system BUS speed.

Does anyone *know* how to change this?

I have done it through the BIOS in several configurations but the system does not like to boot unless set to 200, which is slowing it down heavily!

The following options are present in the BIOS CPU overclock page (current settings in brackets):

HT Frequency Ratio: (Auto)
CPU Frequency: (200)
K8 CPU Clock Ratio: (Auto)
DDR Clock / Timeing Mode: (Auto)

I have tried setting the CPU clock to 400 with the K8 ratio to x6 (2.4GHz), and this sets the RAM to the correct speed of 400, but the system will not boot.

ANY HELP PLEASE??

Thanks.

  ACOLYTE 19:05 22 Mar 06

Looks good as it is to me 400 is 200X2 witch is what it should be and i think that 2.4Ghz is the right speed for the CPU.

  Samuelson 19:10 22 Mar 06

Hi. That is my point...that is how it should be, 400. But it will not boot like that. It will not boot on anything except 200, at which all the bus speeds run at 200.

  ulrich 19:25 22 Mar 06

I am sure this is correct 2 x 200. I to have crucial ram 1gb, it was a cheap one, I will get the number, what number is yours. I have AMD 64 3200, on a ASUS A8NSLI board. I have it set on auto and the CPU IS AT 2060MHZ, FSB 824.
I'll be back.

  Mr Mistoffelees 19:34 22 Mar 06

Your PC is functioning correctly, you do not need to adjust anything. 200MHz is the correct bus. 400MHz is the effective bus speed with double date rate enabled. With the bus at 200MHz, and DDR enabled, all is well and running at full speed.

  Samuelson 19:34 22 Mar 06

I see you have a FSB of 824, mine is only 200. The CPU speed is right, however I just think the FSB is set wrong...instead of 200x12, i think is should be 400x6...allowing the RAM and the FSB to be at 400. Memory number is 16VDDT12864AG40BD1 by the way.

  Samuelson 19:39 22 Mar 06

Thanks for the post. In that case, what is the reason for similar machines but of a lower spec showing "CPU frequency is 333 mhz" or sometimes more, just below the memory test during boot. Wheres this one, a higher spec pc, states 200. Thanks.

  Mr Mistoffelees 19:58 22 Mar 06

"CPU frequency is 333 mhz"

That is 333MHz effective with DDR enabled. The true bus speed in that example is 166.67MHz.

  Samuelson 20:10 22 Mar 06

[" CPU frequency is 333 mhz"

That is 333MHz effective with DDR enabled. The true bus speed in that example is 166.67MHz. ]

So if this machine shows 200, then the true bus speed must be only 100mhz, is that right?

  gudgulf 20:27 22 Mar 06

Quote

"The following options are present in the BIOS CPU overclock page (current settings in brackets):

HT Frequency Ratio: (Auto)
CPU Frequency: (200)
K8 CPU Clock Ratio: (Auto)
DDR Clock / Timeing Mode: (Auto)"


This is the meaning of "Auto"......all your hardware has identifiers and specified settings built in.These report to the BIOS the correct speed at which they run.

With this setting you can be sure you are getting the full rated speed of your cpu and memory.

Your cpu runs at a FSB of 200MHz to which it applies a multiplier of x12 to bring it up to 2.4GHz.

Your memory is also designed for an FSB of 200MHZ,to which it applies a multiplier of x2 to bring it up to 400MHz (DDR means double data rate..which means it actually runs twice as fast as the FSB)

So when you clock speed (or FSB) is reported as 200MHz you have got a cpu running at 2.4GHZ and memory running at 400MHz....exactly as it should.

Running at 400MHz FSB will result in the memory attempting to run at 2x 400 =800MHz which it clearly wont do!!!

Is that any clearer?

  Mr Mistoffelees 20:30 22 Mar 06

I can assure you, with 100% certainty, that your PC is running at the correct speed and that you have nothing to worry about.

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