I can't find the recommended core voltage for a 750FX. Can anyone point me to the information somewhere?

Thanks.

_________________
cheers
tony

Hyperion Support Forum: http://forum.hyperion-entertainment.biz/index.php

@tonyw

One of the better vcore threads:
http://amigaworld.net/modules/newbb/viewtopic.php?topic_id=15763&forum=14

Also DrBombcrater in post #6 here:
http://amigaworld.net/modules/newbb/viewtopic.php?topic_id=9721&forum=33

I vaguely remember Samwel posting a direct link on vcore for 750FX also.
Maybe he'll respond here.

#6

Last edited by number6 on 11-Jun-2006 at 04:56 AM.
Last edited by number6 on 11-Jun-2006 at 04:40 AM.
Last edited by number6 on 11-Jun-2006 at 04:39 AM.

_________________
This posting, in its entirety, represents solely the perspective of the author.
*Secrecy has served us so well*

@tonyw

750fxdd2_ds.pdf , page 10 for vcore voltage - 1.4V to 1.5V.

The 750GX is the same, default vcore is 1.44V, but I have mine set at 1.39V for stability.

_________________
Hate tends to make you look stupid...

@sundown

Doesn`t that make it LESS stable?

_________________
Fraggle

- insert profound text here -

@sundown

Excellent stuff, thanks. Just what I wanted.

_________________
cheers
tony

Hyperion Support Forum: http://forum.hyperion-entertainment.biz/index.php

@Frags

Not neccessarely. 750GX 800MHz has 1.40-1.45V default core voltage.
It can actually be that his A1 is delivering a little bit higher voltage than
what the specs says. So in that case 1.44V would be too much and 1.39V
works fine.
I have mine set at 1.44V and is stable as can be

_________________
/Harry

[SOLD] µA1-C - 750GX 800MHz - 512MB - Antec Aria case

Avatar by HNL_DK!

@Samwel

Usually, the higher you are in the voltage range (but still well within it), the higher the power consumption but at the same time the CPU gets far more stable. Never undervoltage CPUs for any reason.

Also, if it delivers a bit higher, it should still be in spec. For example, if 1.44 is 1.5, it's fine. Heck, it's it's 1.55 it's still fine.

Last edited by AMiGR on 11-Jun-2006 at 03:30 PM.

_________________

@AMiGR

If it`s still solid when undervolted then it could be a prime candidate for overclocking :o)

_________________
Fraggle

- insert profound text here -

@Frags

No. Undervoltaging the CPU increases the propagation delay of the gates. If you want to overclock, you do NOT undervoltage, you use the CPU at the maximum allowed voltage, or if you REALLY know what you are doing, overvoltage.

_________________

@AMiGR

What I mean to say is: if it`s stable at a low voltage then it will handle high voltages well hence, overclock well. Like an Athlon mobile for example.

_________________
Fraggle

- insert profound text here -

@Frags

Ah, yes, indeed.

_________________

@AMiGR

I wonder what you can get the bus up to on an Articia (in an overclocking situation). Does the ram run at 133 or 100?

_________________
Fraggle

- insert profound text here -

@Frags

My micro would sometimes boot to a black screen & almost always would lock up in the first couple of minutes. I went up to 1.49V, but the lockups got worst. At 1.39V, the black screen & lockups were gone.

Samwel has a valid point, as every component has a +/- tolerance & that could easily change the default voltage up or down.

I did look into overclocking my system. I was hoping my GX was a 933MHz part, I removed the heatsink & read the part number, but it was a 800MHz chip, so no overclocking for me.

/me waiting for the 1.7GHz module

_________________
Hate tends to make you look stupid...

@tonyw

Quote:

Excellent stuff, thanks. Just what I wanted.

Great, glad to help.

_________________
Hate tends to make you look stupid...

@sundown

If your system loses stability as you increase the core voltage then I would suspect the cooling system (or an as-yet-undiscovered Articia bug maybe).

_________________
Fraggle

- insert profound text here -

@sundown

You're overheating.

_________________

@Frags

The GX runs very cool so my feeling is the vcore interacts with the rise time of the clock. The rise time of a clock will change slightly as components warm up, changing the prop delay between some signals. As components warm up, you can get a shift in prop delays that can either make a system unstable or make a system more stable. Only way to tell is with the proper test equipment. Been running stable now for the last 7 months.

_________________
Hate tends to make you look stupid...

@sundown

Truly any variation in vcore will affect many things but I believe a check of cooling is in order nevertheless.

_________________
Fraggle

- insert profound text here -

@AMiGR

If I was over heating, the problem would have gotten worst with 'on' time, not better. I still think it was a slight clock shift problem because the instability disappeared when the system warmed up. Just the opposite a heat problem would cause. Would love to have a temp meter running though.

_________________
Hate tends to make you look stupid...

@Frags

Been looking for a temp monitor that can be easily installed & I've checked the cooling, but I just don't see a problem there.

I was an Engineering Tech for 15 yrs & I've seen more timing problems then I care to mention.

_________________
Hate tends to make you look stupid...