Hello everyone,
I have been having some great success with Gigabyte boards lately and recently purchased a 3rd such board for a system I'm building for a friend. This time, I went with the GA-EP45-DS3L. This is paired up with an Intel Dual Core E5200 and a 2x2GB Buffalo FireStix rated at 5-5-5 and 1066MHZ.
At an Intel recommended Max VCore of 1.35625V, the maximum Prime95 stable clock I can get is 300 FSB x 11 multiplier = 3.3GHZ. This is a little less than I was expecting with this CPU at that voltage. It was not stable at 300 x 11.5 (lasted 4.5 hours on Prime95) or 280 x 12.5 (lasted 10 minutes on Prime95).
In any case, what I am having problems with are twofold:
1. MCH Latch Frequency. I want to run the memory at 1:1 with the FSB, which at the current 300MHZ BUS would result in a 1000MHZ RAM speed. However, when I select 3.33D (the 400MHZ Strap which I believe would result in a 1:1 ratio), the system fails to post. Instead, I must select 3.33C (200MHZ Strap), which runs the RAM at 1000MHZ but at a 3:5 ratio.
Similarly, I have tried 3.20B (333MHZ Strap), which results in a RAM speed of 960MHZ, but this also does not post.
I CAN run the RAM at 3.20A (266MHZ Strap) at 960MHZ which results in a 2:3 ratio.
I have tried raising the MCH voltage to 1.2V and raising the static tRead time (tRd) to 10 for each module without any success at the high frequency Straps.
So, the question I have is why cannot I run my RAM in a 1:1 ratio? In the P35 chipset boards I'm using, I simply select the RAM multiplier (I don't worry about the straps), and the board seemed to figure out the best ratio for me.
2. The stock speeds for my RAM modules are 5-5-5-18 at 1066MHZ. At its current timings of 5-5-5-18 at 1000MHZ, it runs flawlessly and passes memtest86+ without error. However, I wanted to test these modules at full stock speed, so I lowered the FSB to 266MHZ and selected the 4.00C multiplier which gave me exactly a RAM speed of 5-5-5-18. The system, however, was not stable at these settings.
Other than manually setting the 5-5-5-18-2T timings and the DDR voltage to the recommended 2.1V, I did not make any other RAM timing changes in BIOS (they have been left on AUTO). Are there some other RAM settings I should manually change to see if these RAM will indeed run at stock?
I find it hard to believe that the RAM runs ok at 1000MHZ but not 1066MHZ.
Thanks.
I have been having some great success with Gigabyte boards lately and recently purchased a 3rd such board for a system I'm building for a friend. This time, I went with the GA-EP45-DS3L. This is paired up with an Intel Dual Core E5200 and a 2x2GB Buffalo FireStix rated at 5-5-5 and 1066MHZ.
At an Intel recommended Max VCore of 1.35625V, the maximum Prime95 stable clock I can get is 300 FSB x 11 multiplier = 3.3GHZ. This is a little less than I was expecting with this CPU at that voltage. It was not stable at 300 x 11.5 (lasted 4.5 hours on Prime95) or 280 x 12.5 (lasted 10 minutes on Prime95).
In any case, what I am having problems with are twofold:
1. MCH Latch Frequency. I want to run the memory at 1:1 with the FSB, which at the current 300MHZ BUS would result in a 1000MHZ RAM speed. However, when I select 3.33D (the 400MHZ Strap which I believe would result in a 1:1 ratio), the system fails to post. Instead, I must select 3.33C (200MHZ Strap), which runs the RAM at 1000MHZ but at a 3:5 ratio.
Similarly, I have tried 3.20B (333MHZ Strap), which results in a RAM speed of 960MHZ, but this also does not post.
I CAN run the RAM at 3.20A (266MHZ Strap) at 960MHZ which results in a 2:3 ratio.
I have tried raising the MCH voltage to 1.2V and raising the static tRead time (tRd) to 10 for each module without any success at the high frequency Straps.
So, the question I have is why cannot I run my RAM in a 1:1 ratio? In the P35 chipset boards I'm using, I simply select the RAM multiplier (I don't worry about the straps), and the board seemed to figure out the best ratio for me.
2. The stock speeds for my RAM modules are 5-5-5-18 at 1066MHZ. At its current timings of 5-5-5-18 at 1000MHZ, it runs flawlessly and passes memtest86+ without error. However, I wanted to test these modules at full stock speed, so I lowered the FSB to 266MHZ and selected the 4.00C multiplier which gave me exactly a RAM speed of 5-5-5-18. The system, however, was not stable at these settings.
Other than manually setting the 5-5-5-18-2T timings and the DDR voltage to the recommended 2.1V, I did not make any other RAM timing changes in BIOS (they have been left on AUTO). Are there some other RAM settings I should manually change to see if these RAM will indeed run at stock?
I find it hard to believe that the RAM runs ok at 1000MHZ but not 1066MHZ.
Thanks.
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