HTT Divider on A8N32 SLI

[plqsvaja]

Where do i set the HTT x1 x2 x3 x4 x5 ?

 

[Regulator07]

depends on your overclock or more specifically your FSB. take whatever your FSB is and mulitply by either 1, 2, 3, 4, 5 and make sure it is not over 1000, you can go slightly over but easier to remain under when in doubt. for example, with a FSB of 240, you would use the 4x multipier to get to 4x240 = 960 HTT. Hope that helps

 

[ND40oz]

I'm not sure about the your board but some boards don't use 1x,2x,3x,4x,5x, instead they list 200,400,600,800,1000. On my MSI board, you have to set the HTT for both the northbridge and southbridge, I believe you have to do the same thing on the A8N32. It should be around where you set your multi and htt speed in the bios.

 

[canadianpsycho]

Don't set it to 1x (or 200) and make sure it doesn't go over 1000, as it can cause system instability on some boards. The difference in performance is negligible.

 

[krotchy]

As far as I can tell, on the A8N32, it doesnt operate the same as most motherboards since it uses 2 seperate chipsets. So you can raise your FSB (mines at 267) to raise your CPU and Memory speeds. However I left my SB to NB chipset at 200 mhz, and my multiplier at 5x, and everything is stable. I figured there was no point in raising my HT bus speed, then lowering its multiplier, as that would probably generate heat for no reason. Unless someone can give me a good reason to OC the SB to NB bus speed, i am keeping it this way.

However to explicitly answer your question, the HTT multiplier is listed at the SBtoNB multiplier. It should be a default 5x, with SB to NB speed at 200.

 

[evilharp]

Originally posted by: plqsvaja
Where do i set the HTT x1 x2 x3 x4 x5 ?

Because the A8N32-SLI has two northbridges (essentially 2 nforce4 chips linked together) there are 2 HTT settings you can tweak.

In the BIOS under Advanced=>Chipset you will see 2 HTT selections you can modify.

"K8 to NB frequency" and "SB to NB frequency".

Both offer the options "Auto, 1x, 2x, 3x, 4x, 5x, 6x, 7x, 8x" all are multiples of the FSB (ie. 5x 200mhz = 1000mhz). As mentioned above, it is preferable to keep it at or below 1000mhz for stability reasons.

xBitlabs noticed (sorry I am too lazy to give you a link) that the SB to NB frequency will reset to 2x after a bios reset (cmos clear), bios update or overclock failure. So it is a good idea to make sure that this is set to 5x after every update/reset/etc... xbit found that it can reduce overal system performance by a good margin if it is left unchecked.

This is covered in detail in the manual.

 

[DrZDO]

Originally posted by: evilharp

Originally posted by: plqsvaja
Where do i set the HTT x1 x2 x3 x4 x5 ?

Because the A8N32-SLI has two northbridges (essentially 2 nforce4 chips linked together) there are 2 HTT settings you can tweak.

In the BIOS under Advanced=>Chipset you will see 2 HTT selections you can modify.

"K8 to NB frequency" and "SB to NB frequency".

Both offer the options "Auto, 1x, 2x, 3x, 4x, 5x, 6x, 7x, 8x" all are multiples of the FSB (ie. 5x 200mhz = 1000mhz). As mentioned above, it is preferable to keep it at or below 1000mhz for stability reasons.

I was under the impression that the SB to NB multiplier (under chipset tab) applied to the SB to NB frequency (under jumperfree tab), not the FSB. Is that not correct? If I'm wrong, mine's running at 1625 (325x5 instead of 200x5).

 

[evilharp]

Originally posted by: DrZDO

Originally posted by: evilharp

Originally posted by: plqsvaja
Where do i set the HTT x1 x2 x3 x4 x5 ?

Because the A8N32-SLI has two northbridges (essentially 2 nforce4 chips linked together) there are 2 HTT settings you can tweak.

In the BIOS under Advanced=>Chipset you will see 2 HTT selections you can modify.

"K8 to NB frequency" and "SB to NB frequency".

Both offer the options "Auto, 1x, 2x, 3x, 4x, 5x, 6x, 7x, 8x" all are multiples of the FSB (ie. 5x 200mhz = 1000mhz). As mentioned above, it is preferable to keep it at or below 1000mhz for stability reasons.

I was under the impression that the SB to NB multiplier (under chipset tab) applied to the SB to NB frequency (under jumperfree tab), not the FSB. Is that not correct? If I'm wrong, mine's running at 1625 (325x5 instead of 200x5).

I wish I had a 100% answer for you, but I don't.

The manual shows an MHz selection instead of a multiplier for the SB to NB frequency. However, the bios gives you a multiplier (I have 1103). 5x is the "prefered setting" according to xbit labs and others, and I assume it is 5x200 for 1000mhz (@ stock/default).

Now, here is the catch. For CPU to NB frequencies 1000mhz or below seems to be the prefered speed. But I have yet to see any comments on an "overclocked" SB to NB frequency. I have no idea what application (if any) can display the HTT rate for SB to NB communcations. So, if you are running at 1625, have you experienced any weird stability issues?

 

[DrZDO]

Originally posted by: evilharp

Originally posted by: DrZDO

Originally posted by: evilharp

Originally posted by: plqsvaja
Where do i set the HTT x1 x2 x3 x4 x5 ?

Because the A8N32-SLI has two northbridges (essentially 2 nforce4 chips linked together) there are 2 HTT settings you can tweak.

In the BIOS under Advanced=>Chipset you will see 2 HTT selections you can modify.

"K8 to NB frequency" and "SB to NB frequency".

Both offer the options "Auto, 1x, 2x, 3x, 4x, 5x, 6x, 7x, 8x" all are multiples of the FSB (ie. 5x 200mhz = 1000mhz). As mentioned above, it is preferable to keep it at or below 1000mhz for stability reasons.

I was under the impression that the SB to NB multiplier (under chipset tab) applied to the SB to NB frequency (under jumperfree tab), not the FSB. Is that not correct? If I'm wrong, mine's running at 1625 (325x5 instead of 200x5).

I wish I had a 100% answer for you, but I don't.

The manual shows an MHz selection instead of a multiplier for the SB to NB frequency. However, the bios gives you a multiplier (I have 1103). 5x is the "prefered setting" according to xbit labs and others, and I assume it is 5x200 for 1000mhz (@ stock/default).

Now, here is the catch. For CPU to NB frequencies 1000mhz or below seems to be the prefered speed. But I have yet to see any comments on an "overclocked" SB to NB frequency. I have no idea what application (if any) can display the HTT rate for SB to NB communcations. So, if you are running at 1625, have you experienced any weird stability issues?

1103 here too. Like I said, I'm leaning toward thinking it's 200x5. In any case, the machine's memtest/prime stable at these settings, and acts stable too. (K8>NB is 325x3.)