Proper Timing / BIOS Settings for GA-EP43-UD3L and 2x2GB G-Skill DDR2

This should be a simple enough question.

What are the BIOS settings I need to run my G-Skill memory (PC2 8500) at 1066 on this Gigabyte motherboard (GA-EP43-UD3L)? If I install the memory (at #1 and #3) and go with the automatic settings, BIOS detects all 4Gs, but Windows 7 (64-bit) halts at the "gathering fireflies" logo and reboots.

Now if I adjust to run the memory at 800 (see the screenshot below), Windows 7 loads and I'm able to do quite a bit, but I was able to run my memory at 1066 on the mobo I just replaced (GA-P35-DS3L) automatically, and the difference in speed is very evident when game levels are loading or with the occasional lag before executing commands.

Any assistance would be appreciated. And if you need to see the BIOS settings as they are right now, let me know and I'll post those shortly.


5 answers Last reply
More about proper timing bios settings ep43 ud3l 2x2gb skill ddr2
  1. Check the ram label for voltage requirements, and adjust the memory voltage in the bios. Or check newegg for the specs. The recommended timings on cpuid's screen should work fine. And if your board says it will run ram at 1066, then try manually setting it at 1066 (or 533; many bios list the ram speed at half the actual speed).
  2. Post part number of DIMMs and CPU type, and I'll give you a set of parameters...
  3. bilbat said:
    Post part number of DIMMs and CPU type, and I'll give you a set of parameters...

    Per Request:

    - G.SKILL 4GB (2 x 2GB) 240-Pin DDR2 SDRAM DDR2 1066 (PC2 8500) Dual Channel Kit Desktop Memory Model F2-8500CL5D-4GBPK
    - Intel Core 2 Duo E6750 Conroe 2.66GHz 4M shared L2 Cache LGA 775 65W Dual-Core Processor

    And the BIOS on the Gigabyte mobo is F7, which I believe is up-to-date for that model.

    Thank you in advance.
  4. I have the same motherboard and RAM, and I was only able to run it at 800MHz instead of 1066MHz until the F8 BIOS were released. After the BIOS update, I had to change my voltages, but now my computer is running stable with 1066MHz RAM!

    DRAM Voltage: 2.1V (default 1.8V)
    North Bridge / MCH Voltage: 1.2V (default 1.1V)

    Link to the BIOS update page:

    Hope that helps.
  5. If you'll list processor and how many DIMMs, I can give you a full parameter set; if you have any other than stock cooling, I include a 'gentle', easy-on-the-hardware (but noticeably faster!) overclock...
Ask a new question

Read More

Gigabyte BIOS Memory G.SKILL Motherboards