A little question about HT bus.

chris.hoops78 · 18 Jun 2009 at 16:30

Excuse my ignorance but.

speed of HT is apparently derived from 5x FSB. This is certainly consitent with my current processor Athlon 4400+

However, from what I have seen from the CPU-Z readouts for phenom II chips these operate with a HT of 2000MHz when the FSB is 200. i.e. FSB x 10.

My board is MA790x-DS4 and i've noticed when overclocking that i need to keep the HT fairly low (like below 1250) or it just wont go. If I drop a phenom II in will i need to radically reduce the HT multiplier to get down to 1250? Or is my understanding of how this works completely off??

chris.hoops78 · 18 Jun 2009 at 20:19

I'm not loving the fact that this must be an easy one for the majority of people on here, yet no one can be arsed to help out.

nathanc · 19 Jun 2009 at 13:06

I don't believe that is the case. As far as I understand it, the HT speed depends on the processor because the memory controller is inside the processor.

The Phenom and Phenom II processors work with a higher HT speed because it is a newer version of HT which operates at a higher speed, i.e. you can't calculate it in the same way.

chris.hoops78 · 19 Jun 2009 at 13:45

Nathan, thanks for your response.

I've done a little reading up - you are right the phenom II's seem to run at 2000Mhz HT by default - an HT multiplier of x10 (200Mhz FSB).

My board apparently hates being overclocked above 2000MHZ, e.g. with 210Mhz FSB giving 2100Mhz HT will just give up, so need to underclock the HT multi to get higher FSBs. Kindof what i assumed i'd have to do, but not so extreme.

I'm am concerned about heat on the northbridge, its very toasty as it is, with just a 4400+ installed. Am planning on some aftermarket cooling to try and sort this out. I have a feeling my board will pop with the new chip otherwise.

razer1978 · 10 Jul 2009 at 17:08

chris.hoops78 said:
Nathan, thanks for your response.

I've done a little reading up - you are right the phenom II's seem to run at 2000Mhz HT by default - an HT multiplier of x10 (200Mhz FSB).

My board apparently hates being overclocked above 2000MHZ, e.g. with 210Mhz FSB giving 2100Mhz HT will just give up, so need to underclock the HT multi to get higher FSBs. Kindof what i assumed i'd have to do, but not so extreme.

I'm am concerned about heat on the northbridge, its very toasty as it is, with just a 4400+ installed. Am planning on some aftermarket cooling to try and sort this out. I have a feeling my board will pop with the new chip otherwise.

same here but my board defaults to 1800MHz, is this normal??