VOGONS


First post, by Danger Manfred

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Hi.

I'm using this board:
https://theretroweb.com/motherboards/s/asrock-4coredual-vsta

And this CPU:
https://www.techpowerup.com/cpu-specs/pentium-e5800.c856

With the default voltage of 1.3625V, I was able to raise the FSB from 200 to 16x233, which gives me a clockspeed of 3728 MHz.

However, at 16x240, I get freezes in benchmarks. No biggie, the CPU runs fine up to 16x266 on another board. Just have to raise the Vcore a bit.

But here is the problem: the BIOS doesn't have an option for that! Even though it supports CPUs running at higher voltages.

I did not find any modifications for that, the latest Beta (2.39a) is great, and unlike 2.30 doesn't claim my E5800 was running at 12.69 GHz, which is nice, but it cannot be that hard to just let me select the Vcore manually, can it?

What I did find is a VID mod guide for socket 775 CPUs, see attachment, but frankly I do not understand it. It shows me to connect two pins with conductive ink, but also shows the silver color indicating conductive ink on a single pin, which doesn't make sense at all.

I have no issues risking a near-worthless E5800 in the process, but would like to at least know what to do so I get the voltage I need.

Can anyone help me out?

edit: attached what the calculator wants me to do, maybe I'm just interpreting it wrong

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Reply 3 of 6, by ux-3

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Yes.
I have used this or a later version in the past many times.
But I remember faintly that it worked in open office but not in Office 2007.

I have by now received several different pictures, which all seem pointless. Are you sure you downloaded the latest version? There were several versions in the past.

Retro PC warning: The things you own end up owning you.

Reply 4 of 6, by Danger Manfred

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No, I'm not sure I did, it was simply the only one I found.
Maybe I'll find someone who has already VID modded the E5800, it's the last socket 775 CPU ever made and a popular model after all.

Reply 5 of 6, by agent_x007

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Visual PDC E5800 VID mod :
4z44M0g.jpg
7qkprL3.png

Short version :
You can check on VID table I attached above how different VID pins adjust Vcore.
If you have CPU with default VID between 1.225V and 1.3125V, a simple bridge between VID4 and VSS will give you +0.1V on Vcore (from boot).
^This one is my recommendation for most E5800s.

For your CPU with "default voltage of 1.3625V", a VID5 to VSS would be better (getting you +0.2V).
Main reason for that recommendation is a complicated route to bridge VID4 and VCC :
Doing "VID5 to VSS" and "VID4 to VCC", is required for +0.1V to work (again for 1.3625V default VID).
Alternatively, you could try to do "VID3 to VSS" - but that will give you only extra +0.05V.

Side note : For anyone with 1.2125V VID and lower, you are lucky - bridging VID6 to any VSS will net you +0.3V on Vcore.

Last edited by agent_x007 on 2024-08-25, 13:29. Edited 2 times in total.

Reply 6 of 6, by Danger Manfred

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First of all: BIG thanks! That was exactly what I needed. I'm not sure I understand the table yet, but I'll look at it again later today with a bit more time and a clear mind.

I think the info from Techpowerup might be wrong, since I just looked into my BIOS' hardware monitor and Vcore is jumping back and forth between 1.258 and 1.274 V, so I believe the real voltage might be 1.2625, not 1.3625.

Will just need to see what I should bridge then instead, and I'm good to go. I could find two more E5800 in my drawer, so if one of them bites the dust, so be it.