Cannot get ram to run at 1066mhz

I have 2x1gb of Kingston HyperX PC2-8500 ram but it only runs at PC2-6400. I went into the BIOS and changed the timings to 5-5-5-15 and the DRAM voltage from 1.8v to 2.2v as the ram sticker specifies. However in the BIOS and in CPU-Z it still reads at PC2-6400 with a DRAM frequency of 400mhz and shows the voltage still at 1.8v??. Why isn't it 1066? My timings changed from 5-5-5-18 to 5-5-5-15 but the frequency and voltage is the same according CPU-Z :heink: What else do I need to change?

Gigabyte EP45-UD3L LGA 775 motherboard (rev 1.1)
Intel Core 2 Quad
Q8300 stock
2gb Kingston HyperX PC2-8500
Visiontek ATI Radeon 3870 512mb GDDR4
250gb Western Digital Caviar Blue 16mb cache 7200rpm
Windows 7 Home Premium 64bit
Antec Basiq BP550 550 watt modular PSU
7 answers Last reply
More about cannot 1066mhz
  1. You will need to manually change the FSB : DRAM multiplier in your BIOS to change the frequency. There should be an option to do so in the same place you would change the cpu's frequency.
  2. what would I change it to exactly? sorry i'm kind of new to building pc's do you mean the 5:6 thing? where in the BIOS would that usually be i'm looking for the setting but cant seem to find it maybye i'm blind
  3. I tried to raise the MCH core from 1.1v to 1.2v to see if it makes a difference still nothing. I really need some help here :ouch: I don't want to screw something up that is why i'm asking for clarification. The only things in my BIOS that I can change is the SPD or my (G)MCH frequency latch. Which should I change and to what should I change it too?? I already raised my DRAM voltages MCH voltage and manually set timings and it still will not go to 1066mhz :fou:
  4. In MB Intelligent Tweaker, you need to find the System Memory Multiplier and change it to 5 : 8 or 3.2.
  5. In my BIOS there aren't ratios though there are like numbers like 2.00D 2.00B 3.00ABC etc. What should I choose? this is very confusing sorry
  6. Alright so my CPU host clock control - currently have this on 333 so would I change my system memory multiplier to 3.2C? If I remember correctly FSB * memory multiplier = memory speed so if C is for 333FSB I should change to 3.2C which would be 3.2*333 which equals 1066?
  7. Yes, 3.2 is what you want as the mem multiplier. Make sure you run memtest to make sure its stable after you increase the frequency; DDR2 1066 tends to be finnicky, even under the manufacturer's specs. You may need to up the DRAM voltage if it is unstable.
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