I bought a used Gigabyte GA-880GM-UD2H Mainboard, which came with Patriot Viper III DDR3 2X2 GB kit (rated to 1600 MHz.) I wanted to increase the RAM. While knowing it is not generally advised, I figured it would probably work to buy another set of Patriot Viper III. I wanted to try for 12 GB, so I bought Patriot 8 GB kit (2X4) Viper III DDR3 1600MHz -- PV38G160C9K. I knew it might need some adjustment, but figured the combo should run okay.
The memory does seem solid enough--I've not gotten any errors in testing yet. Main thing now is to get the best speed with stability out of this combo. I seem to get better performance by running them at 1333 and using 7-7-7-24 or 7-7-7-20 timings rather than CL9 at 1600.
What is confusing me and I haven't completely figured out is why the Trfc is so different between these sets, and what I should do manually since I am running other timings manually. The 2X2 GB set runs with Trfc @ 110 ns each module, but the 2X4 GB set runs at 300 ns each--and the Gigabyte board balks if I try to lower that. It seems like they will all run together with this set as 300 for the 2X4 and simultaneously at 110 for the 2X2. They will also run if I set the 2X2 GB modules up to 160, or up to 300. It even appears doing either of these options does not affect the speed Memtest 86 reports for transfers (so long as I mount the 2X4 GB in the slots closest to the CPU), but I have not used the board long enough yet to say if all three options will run equally stable. Where is it best to set the Trfc for the older 2X2 Viper III set in this situation?
BTW, the other thing that seems clear is that the 4 GB set processes a bit faster (more GB/sec in Memtest) than I can get the 8 GB set to process, and I can't seem to adjust settings to change that.
Thanks,
Michael
The memory does seem solid enough--I've not gotten any errors in testing yet. Main thing now is to get the best speed with stability out of this combo. I seem to get better performance by running them at 1333 and using 7-7-7-24 or 7-7-7-20 timings rather than CL9 at 1600.
What is confusing me and I haven't completely figured out is why the Trfc is so different between these sets, and what I should do manually since I am running other timings manually. The 2X2 GB set runs with Trfc @ 110 ns each module, but the 2X4 GB set runs at 300 ns each--and the Gigabyte board balks if I try to lower that. It seems like they will all run together with this set as 300 for the 2X4 and simultaneously at 110 for the 2X2. They will also run if I set the 2X2 GB modules up to 160, or up to 300. It even appears doing either of these options does not affect the speed Memtest 86 reports for transfers (so long as I mount the 2X4 GB in the slots closest to the CPU), but I have not used the board long enough yet to say if all three options will run equally stable. Where is it best to set the Trfc for the older 2X2 Viper III set in this situation?
BTW, the other thing that seems clear is that the 4 GB set processes a bit faster (more GB/sec in Memtest) than I can get the 8 GB set to process, and I can't seem to adjust settings to change that.
Thanks,
Michael
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