How do I overclock my 1055T?
First off: make sure you have adequate cooling! The on-die CPU sensor is not accurate and tends to be roughly 10C below the temperatures read at the motherboard socket. The temperature max listed by AMD is 62C
, but with the inaccuracy of the on-die sensor, it's hard to say exactly. They tend to run more stable than other older Phenom II at higher temperatures.
The maximum voltage listed by AMD is 1.400v
, but this also doesn't make a lot of sense as the stock voltage is 1.375v and the Turbo Core voltage 1.475v. So, the maximum voltage is probably somewhere up around 1.500v, since that's what it would hit with Turbo Core anyway.
1. Lock PCI-e bus at 100mhz (most boards do this automatically).
2. Disable Turbo Core and Cool'N'Quiet. Note
: These chips also have a hardware form of CnQ that is not able to be disabled on some motherboards. However, this does not seem to have any impact on overclocks, so if you processor drops multiplier/vCore when idle, don't worry.
3. Raise FSB to and adjust multiplier to whatever speed you want for the processor (final speed = FSB * multiplier).
4. Raise the CPU vCore (my chip does 3.6GHz at 1.35v, 3.8GHz at 1.42v and 4GHz at 1.475v).
5. Drop northbridge multiplier and the hypertransport multiplier. The stock value is 10x/2000MHz for both (sometimes listed as only 2000MHz in the BIOS). The BIOS setting always represents the multiplier and not a final speed (eg, 1800MHz would be a 9x multiplier). Some people have stated that an overvoltage/overclock on the CPU northbridge is necessary to obtain high overclocks on the cores, but I have not found this to be the case. There may be enhanced data transfers rates at higher NB clocks/volts, but I failed to see a lot of real world benefit in it when testing games/benchmarks.
6. Drop RAM divider (EG instead of 1600MHz choose 1066MHz/1333MHz for DDR3 or 533MHz/666MHz/800MHz for DDR2). While the dividers are always listed in speeds, they also represent a divider, much like the HT/NB represents a multiplier in the BIOS. For instance, on a DDR-3 Board 1600MHz is actually a 1:4 FSB:RAM ratio (for 800MHz, 1600MHz effective). Some motherboard models, especially those based on the 7XX chipsets, have trouble booting at stock speeds, so if you fail to boot after attempting an overclock, attempt to underclock the RAM and see if that alleviates the problem
.So, I've booted up to Windows okay, now what?
Stability test! I recommend running 12 hours of Prime95-32
at the same time. In my experience, if it survives that, it'll survive anything. Be sure to monitor your temperatures as well, with recommended programs being Everest, CoreTemp or SpeedFan.