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Please be aware that at this point in time 1066MHz support is not guaranteed on every motherboard and CPU. Unfortunately, some boards have a better BIOS than others and as such will offer superior support for a 1066 mode. A few steps to get the best results when attempting 1066 mode.
1. Ensure your motherboard has full Phenom II/1066MHz support from the manufacturer and that you are running the latest BIOS.
2. Do not try to achieve 1066MHz via overclocking the bus or the memory via the 800MHz divider, you will NOT be able to achieve the speeds in this way as the internal memory controller (IMC) timings will still be too tight. Hence, you must first enabled 1066MHz mode specifically to relax these timings.
3. Ensure the memory timings are set loosely enough to accept these speeds. My recommendation would be: CAS 5, TRCD 6, TRP 6, TRAS 24, TRC 30 and a TRFC of 195us or 52-55 (depending on how your motherboard lists it).
4. Max voltage you should ever need for this mode is 2.0v. If you are still noticing instability, 99% of the time it will not be solved by increasing vdimm further past this point. Most of the time 1.9v should suffice for stability with most 2x2GB modules at these speeds and timings.
5. 4GB and 8GB are entirely different animals on this platform and should be treated as such. 8GB will add extra heat to your CPU via the IMC and will also put extra stress on the board. The two primary variables to keep in mind when going from 4GB to 8GB on an AM2+ system are heat and voltage. The former will increase as a side effect of the extra memory and will need to be dealt with in the form of active cooling over the memory and/or better cooling of the CPU. The latter will most likely need to be increased to maintain stability. When going to 8GB, test first, and if it is found to be unstable where previously 4GB was stable, look to gently increase CPU-NB as well as motherboard NB voltages. Increase by .025v increments on CPU-NB first. Do not increase more than .075v at stock CPU-NB speeds as it is unnecessary. If you are still seeing instabilities, look to increase the motherboard NB voltage by the same amount.
6. Always test BEFORE trying to boot into Windows. This will save you a lot of headaches, assist you in the troubleshooting of the issue, and most importantly...it will save your Windows installation! Run Memtest86 for at least 10 loops of test 5 to test initial stability and at least 60 passes to test more thoroughly.
As always, your mileage may vary, but in following these steps you should be able to increase your chances of being able to run 1066 mode.
1. Ensure your motherboard has full Phenom II/1066MHz support from the manufacturer and that you are running the latest BIOS.
2. Do not try to achieve 1066MHz via overclocking the bus or the memory via the 800MHz divider, you will NOT be able to achieve the speeds in this way as the internal memory controller (IMC) timings will still be too tight. Hence, you must first enabled 1066MHz mode specifically to relax these timings.
3. Ensure the memory timings are set loosely enough to accept these speeds. My recommendation would be: CAS 5, TRCD 6, TRP 6, TRAS 24, TRC 30 and a TRFC of 195us or 52-55 (depending on how your motherboard lists it).
4. Max voltage you should ever need for this mode is 2.0v. If you are still noticing instability, 99% of the time it will not be solved by increasing vdimm further past this point. Most of the time 1.9v should suffice for stability with most 2x2GB modules at these speeds and timings.
5. 4GB and 8GB are entirely different animals on this platform and should be treated as such. 8GB will add extra heat to your CPU via the IMC and will also put extra stress on the board. The two primary variables to keep in mind when going from 4GB to 8GB on an AM2+ system are heat and voltage. The former will increase as a side effect of the extra memory and will need to be dealt with in the form of active cooling over the memory and/or better cooling of the CPU. The latter will most likely need to be increased to maintain stability. When going to 8GB, test first, and if it is found to be unstable where previously 4GB was stable, look to gently increase CPU-NB as well as motherboard NB voltages. Increase by .025v increments on CPU-NB first. Do not increase more than .075v at stock CPU-NB speeds as it is unnecessary. If you are still seeing instabilities, look to increase the motherboard NB voltage by the same amount.
6. Always test BEFORE trying to boot into Windows. This will save you a lot of headaches, assist you in the troubleshooting of the issue, and most importantly...it will save your Windows installation! Run Memtest86 for at least 10 loops of test 5 to test initial stability and at least 60 passes to test more thoroughly.
As always, your mileage may vary, but in following these steps you should be able to increase your chances of being able to run 1066 mode.
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