Hi all,
I just purchased a new Gigabyte Gigabyte A75M-UD2H (AMD Socket FM1 board), an AMD A8-3850 CPU, along with a single F3-14900CL9D-8GBXL kit, for 8GB RAM total. BIOS is updated to version F3 (7/12/2011).
I have found by setting the ram speed manually to 1866 and the memory timings manually as well, that I have a stable system. I have not had to change the RAM voltage from AUTO so far.
I set the Memory Clock to x9.33 (1866 MHz).
Memory timings are as follows:
Command Timing: 2T
CAS# Latency: 9T
RAS to CAS: 10T
Row Precharge: 9T
Minimum RAS Active: 28T
TwTr command Delay: 8T
Trcf0 and Trfc1: 160ns
Write Recovery Time: 16T
Precharge Time: 8T
Row Cycle Time: 42T
RAS to RAS: 6T
Four Bank Activate Windows: 20T
Bank Interleaving: Enabled
I've run memtest86+ for 20 hours with no errors using this config. I've found Windows to be stable.
I noticed that I had to set both the RAM MHz and the memory settings at the same time. If I did just one change and rebooted then the motherboard would reject the settings and go back to defaults. So it seems that both the RAM clock speed and timings should be set simultaneously to take effect.
-amigaguy
I just purchased a new Gigabyte Gigabyte A75M-UD2H (AMD Socket FM1 board), an AMD A8-3850 CPU, along with a single F3-14900CL9D-8GBXL kit, for 8GB RAM total. BIOS is updated to version F3 (7/12/2011).
I have found by setting the ram speed manually to 1866 and the memory timings manually as well, that I have a stable system. I have not had to change the RAM voltage from AUTO so far.
I set the Memory Clock to x9.33 (1866 MHz).
Memory timings are as follows:
Command Timing: 2T
CAS# Latency: 9T
RAS to CAS: 10T
Row Precharge: 9T
Minimum RAS Active: 28T
TwTr command Delay: 8T
Trcf0 and Trfc1: 160ns
Write Recovery Time: 16T
Precharge Time: 8T
Row Cycle Time: 42T
RAS to RAS: 6T
Four Bank Activate Windows: 20T
Bank Interleaving: Enabled
I've run memtest86+ for 20 hours with no errors using this config. I've found Windows to be stable.
I noticed that I had to set both the RAM MHz and the memory settings at the same time. If I did just one change and rebooted then the motherboard would reject the settings and go back to defaults. So it seems that both the RAM clock speed and timings should be set simultaneously to take effect.
-amigaguy
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