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waynemetts

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I recently removed 4 gigs of ddr2 dual channel 400MHz ram and installed 8 gigs of ddr2 800MHz ram. The system recognized it but still says its 400 MHz. What's up with that. Thank you for any help you can give.. :eek:
 
Solution
Folks constantly assume the RAM Frequency is 'Automatic' it is not and the DRAM Frequency per the constants of the CPU and (FSB/BCLK) must be manually set in the BIOS.

Assuming you have Intel Core 2 Quad Q6600 which has a FSB of 266MHz * 2 = DDR2-533.

If CPU-z shows 'DRAM Frequency = 400MHz' then indeed it is running at 800MHz (400MHz * 2 = 800MHz); 'DDR2' = Double Data Rate revision 2. CPU-z shows I/O bus clock (MHz) and not the Data rate (MT/s aka MHz).

In this example the RAM shows 533MHz but to the FSB/BCLK it's actually 1066MHz with 4GB of RAM:
softwares-cpuz-04.jpg

waynemetts

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h3sham

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try disabling the cool and quite option from the bios.....also are you runing the old rams with the new ones or you replaced em...and check the motherboard manual for the memory clock limit
 

waynemetts

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replaced all the ram with the new
 

waynemetts

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cant find the cool and quiet. will check mem clock. bios still sees 1024 mb memory
 
Folks constantly assume the RAM Frequency is 'Automatic' it is not and the DRAM Frequency per the constants of the CPU and (FSB/BCLK) must be manually set in the BIOS.

Assuming you have Intel Core 2 Quad Q6600 which has a FSB of 266MHz * 2 = DDR2-533.

If CPU-z shows 'DRAM Frequency = 400MHz' then indeed it is running at 800MHz (400MHz * 2 = 800MHz); 'DDR2' = Double Data Rate revision 2. CPU-z shows I/O bus clock (MHz) and not the Data rate (MT/s aka MHz).

In this example the RAM shows 533MHz but to the FSB/BCLK it's actually 1066MHz with 4GB of RAM:
softwares-cpuz-04.jpg
 
Solution
^+1 Yep - You're Good! It's running DDR2-800 properly :)

CPU-z confuses and freaks out folks constantly, I've begged them you a longtime to show 'Data Rate' somewhere on the screen...

The RAM itself is indeed running @ 400MHz, but since data is transmitted on both the top and bottom 'pulses' of the Sine wave (Double Data Rate) to the FSB/BCLK Synchronized (Sdram) it's indeed double ( * 2 ).
 

starrb2000

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I have the GA-X58A-UD3R motherboard on which I just installed 12gb of Corsair Dominator GT DDR3 2000 ram. My problem is the bios only shows it's frequency at 1078 instead of the 2000. It's running in triple channel. Please help correct this problem so that it will perform at normal speed. I tried XMP, to get the right speed, but it will not allow Windows 7 to start up.... It just constantly reboots to bios and repeats.

Note: This memory is compatible with this motherboard.

Additional information: CPU-z states that it's running at 539 x 2 = 1078MHz.
Using Windows 7 Pro 64 bit.
Gigabyte GA-X58A-UD3R ver 2.
i-7 950 @ stock speed
4 x 3 Corsair Dominator GT DDR3 2000 MHz. CMT12GX3M3A2000C9



 
@starrb2000 - you need to start a new thread, but typically you need to raise the BCLK to 160MHz. This is to close the disparity between the CPU's IMC and the RAM Frequency i.e. make it more stable.

BCLK 160MHz:
This will also OC your CPU, the i7-950 stock uses a CPU Multiplier or 23 (23 * 133MHz = 3.06GHz therefore 23 * 133.33MHz = X * 160.00MHz ; X = 19 ; set the CPU Multiplier/Ratio = 19 and Memory Multiplier = 12 ; 3.04GHz CPU / 1920MHz RAM)

/and all the BCLK values in-between and over/

BCLK 167MHz:
CPU: 19 * 167MHz = 3.17GHz
RAM: 12 * 167MHz = 2004MHz
 

starrb2000

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Thanks for the help. Unfortunately the changes suggested make my system unstable and it BSoDs. I tried a BCLK of 135, a CPU multiplier of 23 and a Memory multiplier of 14. I'm getting 1890 MHz on my ram and it seems stable so far. Are these numbers ideal for gaming purposes. Why or why not. I've been tinkering and look forward to your suggestions. Thanks.
 
The BSOD may have come from 1. Improper DRAM voltage, 2. Auto vs Manually setting QPI/VTT. Assuming 1.65v RAM ; DRAM = 1.64v and QPI/VTT = 1.35v. Further, you must set the CAS Timings per spec, use Quick so all the DIMMs are set the same and use Command Rate = 2.
 
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