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What does 1000MHz HTT link mean?

A

Aelfgeft

2[H]4U
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Jun 8, 2005
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In another thread, I discussed some problems I'm having with overclocking. They suggested underclocking the HTT link in my BIOS. I can see that I can choose 200MHz increments down from 1000. WHat does it mean? What does it do? And how does changing it allow for more overclocking?
 
The HTT Link cant go over 1Ghz, so you have to lower it, so when you raise the FSB speed it evens out.
 
The HTT link is the interface between your CPU and RAM (in the old days CPU spoke to memory controller, and memory controller spoke to RAM - with A64 memory controller is on the processor, so they had to invent a new protocol - they call this the HTT link).

If your HTT has a 1GHz default, then you are on a S939 motherboard (other A64 boards only run at 800MHz). Most S939 boards have almost no headroom for overclocking the HTT link - they are stable up to only about 1000MHz, so you have to keep it at or under this.

The 200MHz increments do not so much change the actual clock of the HTT - they change the multiplier. Think of it this way: at 1000MHz your LDT Multiplier is 5x, at 800 it's 4x, 600 it's 3x, 400 it's 2x and 200 it's 1x.

Your final HTT speed is the the value of your CPU HTT Speed ("FSB") times the multiplier.

So if your FSB is 230MHz (an overclock of 30MHz), and your HTT speed setting says "1000MHz" (in other words 5x), then your actual HTT Bus speed is 1150MHz (230x5). WAY too high.

But if you reduce your HTT Bus to 600MHz (which changes the multiplier to 3x), your HTT Bus speed will be 690MHz (230x3), which is well within the 1000MHz ceiling.

So basically whatever you do, ensure the FSB times the LDT multiplier (not to be confused with the CPU multiplier - both different things!) doesnt equal more than 1000MHz.

It's stupid that your board lists them in increments of 1000MHz - most list the actual LDT multiplier (unless of course your board is doing the calculation for you and displaying the final HTT Bus).

Hope this helps.
 
Hmmm...apparently I've been running 223x5 pretty stable for a couple weeks now...

My main problem seems to be that whenever I increase my FSB, even if I change the ram ratio and HTT link, two things happen:

1. The SATA controller detects my hard drive with a seriously screwed up name (random spaced out ASCII characters)

2. The Windows loading screens sticks (the blue progress meter runs forever)
 
Everything I have read about the HTT link says you need to stay within 5 to 10 percent of the 1000 mark. I currently run 260x4=1040. I am under the impression that being too far from 1000 in EITHER direction can mess things up. I would actually say that using the 3 multiplier in your case would also be way too low.
 
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