990FX Questions

[Dolk]

I just got a new board in for a review and I noticed something right away. The CPU bus does not jump around as much as the 890GX or 890FX boards. I am wondering if this is the same for all 990FX boards or if its just the board I have.

Added note, the CPU bus (HTT) does not jump around at all. I loaded my 1090T (at stock) to full using benches, and did not see the bus change at all in CPUZ. It was hard locked at 200 MHZ.

[BeepBeep2]

It shouldn't have jumped around on 890FX boards either, it's just a matter of the clock generator the board manufacturer chose to use.

[Dolk]

On the Cross IV with a 1090T, I would see a lot of jumping, especially when I did LN2.

[tiborrr]

Crosshair IV Formula fluctuated 2MHz HTT in my case, no mater stock cooling, -100°C cascade cooling or -190°C LN2.
I don't see HTT fluctuation on Crosshiar V though.

[Dolk]

So I guess thats because of the 990FX?

[chew*]

So I guess thats because of the 990FX?

That would be a bad assumption as electrically 890fx NB are no different from 990.

[BeepBeep2]

It shouldn't have jumped around on 890FX boards either, it's just a matter of the clock generator the board manufacturer chose to use.
I'll just quote myself again

[sin0822]

what board is it?

as far as GB goes, i believe they are using the same realtek clockgen as they did with 890.

[Daveburt714]

I just got a new board in for a review and I noticed something right away. The CPU bus does not jump around as much as the 890GX or 890FX boards. I am wondering if this is the same for all 990FX boards or if its just the board I have.

Added note, the CPU bus (HTT) does not jump around at all. I loaded my 1090T (at stock) to full using benches, and did not see the bus change at all in CPUZ. It was hard locked at 200 MHZ.

I noticed the same thing with the Sabertooth 990FX Dolk :clap:....
I agree with the rest of these folks though, it probably has less to do with the chipset and more to do with
the quality of components/design of the new boards.

I haven't had time to push really hard yet, but the fact that those floating clocks/voltages are gone have helped my OC a little.

[charged3800z24]

I noticed the same thing with the Sabertooth 990FX Dolk :clap:....
I agree with the rest of these folks though, it probably has less to do with the chipset and more to do with
the quality of components/design of the new boards.

I haven't had time to push really hard yet, but the fact that those floating clocks/voltages are gone have helped my OC a little.

My system seems more stable at actual 24/7 OCing. This sabertooth has at least improved that over my CHIV F. 4.2ghz is a breeze with my warm water loop.

[Panther_Seraphi]

Supposedly Asus moved the clockgen crystal on some of their boards to a different location to prevent issues with LN2 freezing them. Perhaps this relocation also helped with ambient temperature stability?

[Karolis]

Can it be attributed to spread spectrum settings?