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Gigabyte p35/8 GB/TWIN2X4096-6400C5DHX


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I recently completed an RMA on the memory mentioned in the title. Of course it was also for the motherboard series also in the title.


I'm posting this since few users post on their experiences running 8GB on Vista 64.


I recently built a Gigabyte GA-P35C-DS3R with a Q6700 CPU and 8GB of Corsair twin2x4096-6400c5dhx RAM. One stick of the RAM was faulty and Corsair replaced it pronto. While waiting for the replacement RAM I installed Vista 64 with the remaining two good sticks.


Performance was SUPERB with this (4GB) installation! Then the replacement 4GB arrived....trouble....


Installing the additional 4GB caused things to slow to a horrible crawl...in fact, my new system ran slower than a two+ year old Dell XPS *laptop* I frequently use. Just to make sure it wasn't the RAM, I reinstalled with a single drive (this system is all WD 10k SATA Raptors), and experienced the same slow disappointing results.


Bottom line: I thought it was the RAM. Nope...running just the replacement pair (system total of 4gb) gave me the same performance as my initial 4gb installation.


Snooping around the internet didn't offer a lot of clues to solving this problem. However, I was able to find that Gigabyte DOES have a problem with the P35 chipset, Vista 64, and 8GB of RAM. In fact, I came across the following: http://www.giga-byte.lv/products/mb/bios/ga-g33-ds3r.html


Now, that's not for MY motherboard but, nonetheless, I updated my BIOS from F2 to F4 (there is no F3 for the GA-P35C-DS3R) and MAGIC! The updated BIOS was the secret ingredient to my performance problem.


Also, as a final note: I DID have to lower the timing on my Corsair TWINs from 800 to 667 (in Gigabyte terms: lower the memory multiplier from 3.0, or auto, to 2.50) to gain stability with 8GB of RAM.


Anyways...hope this helps someone else configuring/building a new system...



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  • 2 months later...

Agreed with above ^.


You have saved me some later grief.. : )))))))))


Buying 4gb of same modules plus the same board, i was able to determine from yur contribution they will function fine at 800mhzzzz before any BIOS flashes.


Assuming the 8Gb config was the catalyst for the prollem, that is.. :)


Thanks again.


- Kt

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  • Corsair Employees

With 4 modules DDR667 would be suggested. However you can sometime make t run at DDR800 with 4 modules by setting the NB/MCH Voltage to +.05 Volts and setting the memory Voltage to 2.0 Volts.



Also You'll need to install MS patch 929777 from Microsoft for more than 3 GIG in Win Vista. You can search for it at http://www.microsoft.com.

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