The GA 586DX is not picky about RAM. You can use most EDO and FPM modules, if you want to max memory out with 4 x 128MB you will probably have to use FPM sticks. The difference in performance is very very small. Make sure you have the latest BIOS for maximum compatibility.
I doubt you can run this board at 75 or 83 MHz FSB. It doesn´t even have settings for that and the highest mustiplier is x3.5. So you´re restricted to 2 x Pentium MMX 233 (1.5 x 66 setting).

majestyk wrote on 2023-02-27, 07:25:

The GA 586DX is not picky about RAM. You can use most EDO and FPM modules, if you want to max memory out with 4 x 128MB you will probably have to use FPM sticks. The difference in performance is very very small. Make sure you have the latest BIOS for maximum compatibility.
I doubt you can run this board at 75 or 83 MHz FSB. It doesn´t even have settings for that and the highest mustiplier is x3.5. So you´re restricted to 2 x Pentium MMX 233 (1.5 x 66 setting).

Thanks,
The onboard PLL is rated at 83Mhz, so I want to try with setFSB with proper ram.
Do you know anything about the HP workstation and ram I mentioned?
Should be ok?

These should be working perfectly. Since the chips are 8MB you need 16 chips for a 128MB stick so they will be double-sided.
I use very similar 128MB sticks (IBM) on my GA-586DX (with Samsung chips and parity) and never had any problems - except for one stick:
Any chance repairing 128MB FPM-SIMMS with parity?

What CPU(s) are you going to use for FSB overclocking?
If the clock generator is capable of 75 or 83 MHz, this doesn´t mean the chipset, cache- and TAG-chips can handle this. Intel´s 430HX chipset is a bad overclocker...

Avoid the weird server sticks. The one you linked is the one you want probably.

If you can get the onboard pll to do higher than 66mhz please share it in Pentium MMX 233 aiming for the stars! you will likely have to set it via hardware. Pull up/pull down.

majestyk wrote on 2023-02-27, 07:25:

The GA 586DX is not picky about RAM. You can use most EDO and FPM modules, if you want to max memory out with 4 x 128MB you will probably have to use FPM sticks. The difference in performance is very very small. Make sure you have the latest BIOS for maximum compatibility.
I doubt you can run this board at 75 or 83 MHz FSB. It doesn´t even have settings for that and the highest mustiplier is x3.5. So you´re restricted to 2 x Pentium MMX 233 (1.5 x 66 setting).

I run sticks that look just like that and have same specs (may be the same ones) in my tyan s1564D Edo, 60ns same size and numbet of chips. 5v and have all supported 512mb filled up. It has the same chipset as the 586dx

Devices like the multiplier mini or a interposer (see pcb projects in sig) can allow you to set any supported multiplier by the cpu. The 586dx I’m pretty sure would support most if not all super socket 7 cpus, if only at 66mhz bus. The linear regulators might be a weak point but there are ways to upgrade them. Bios support of said cpus may be lacking. But other than that, I don’t see why a tillamook at 66x4, a cyrix 366 at 66x4 or a k6-3/3+ at 66x6 couldn’t be made to work. Provided you could get the proper voltage programmed or upgraded to.

Re: Diy modding support for k6+And 120gb hard drives into bios roms

Re: vrm module project thread roundup, share ideas, make new designs

Socket 5/7/SS7 (Multiplier Mini) Tweaker (Released)

Re: Gigabyte GA-586HX (Rev. 1.53)

Tillamook 266MHz and working L2 cache?

majestyk wrote on 2023-02-27, 08:14:

These should be working perfectly. Since the chips are 8MB you need 16 chips for a 128MB stick so they will be double-sided. I u […]
Show full quote

These should be working perfectly. Since the chips are 8MB you need 16 chips for a 128MB stick so they will be double-sided.
I use very similar 128MB sticks (IBM) on my GA-586DX (with Samsung chips and parity) and never had any problems - except for one stick:
Any chance repairing 128MB FPM-SIMMS with parity?

What CPU(s) are you going to use for FSB overclocking?
If the clock generator is capable of 75 or 83 MHz, this doesn´t mean the chipset, cache- and TAG-chips can handle this. Intel´s 430HX chipset is a bad overclocker...

Indeed. A k6-3/2+/3+ might shine with disabled on-motherboard cache, and disabled onboard devices in favor of add in cards. Sata, pata, etc.

My guess is that 75 may work, but 83 may be asynchronous and cause a no post. That’s what I saw on my p55xb2 when I forced settings via the pins directly. 83 may be too much for it anyway.

majestyk wrote on 2023-02-27, 08:14:

These should be working perfectly. Since the chips are 8MB you need 16 chips for a 128MB stick so they will be double-sided. I u […]
Show full quote

These should be working perfectly. Since the chips are 8MB you need 16 chips for a 128MB stick so they will be double-sided.
I use very similar 128MB sticks (IBM) on my GA-586DX (with Samsung chips and parity) and never had any problems - except for one stick:
Any chance repairing 128MB FPM-SIMMS with parity?

What CPU(s) are you going to use for FSB overclocking?
If the clock generator is capable of 75 or 83 MHz, this doesn´t mean the chipset, cache- and TAG-chips can handle this. Intel´s 430HX chipset is a bad overclocker...

You mean ram from HP Visualize B180L?
Or the one I linked?
Because the first is cheap and I can find even here in Italy. Here an example but a bit pricey (just to let you see the chips):

https://www.ebay.it/itm/155307644819?mkcid=16 … emis&media=COPY

The linked one from previous post is from US and will cost a leg in taxes and shipment…

Please don’t buy those sticks, I have a bad feeling they are proprietary.

Here are mine on my tyan

Got it,
Thanks

No prob.
I don’t see the via holes that connect the two sides normally on those hp sticks. Those might be 144 pin.

Sphere478 wrote on 2023-02-27, 09:28:

No prob.
I don’t see the via holes that connect the two sides normally on those hp sticks. Those might be 144 pin.

Actually they are 72pin and there are holes. Of course there are plenty of chips.
I will follow your suggestion and wait for something here in EU…

Mamba wrote on 2023-02-27, 10:01:

Sphere478 wrote on 2023-02-27, 09:28:

No prob.
I don’t see the via holes that connect the two sides normally on those hp sticks. Those might be 144 pin.

Actually they are 72pin and there are holes. Of course there are plenty of chips.
I will follow your suggestion and wait for something here in EU…

Na, those aren’t right. That’s proprietary stuff

This is what you want>

Btw, I wonder if in single cpu mode if your two linear regulators feed the single cpu or if they are split between the sockets. Would be curious to know of there was continuity between the two vcc2 of each socket. If so, dual regulators would probably handle whatever single cpu you could throw at it?

I was referring to the ones on Ebay, where the seller states they are compatible "with systems that support 128MB FPM sticks" what the GA-586DX definitely does.
But extraterrestial shipping costs have prevented me more than once to order memory from US sellers.

Are you saying that it supports FPM? In which case I agree.

Or are you saying that it ONLY supports FPM
And not EDO, in which case, color me surprised. why would this be?

Btw for boards that only support FPM (430nx?) there is a way I believe to mod some newer EDO sticks to make them act like FPM, though I don’t recall details.

The Gigabyte GA-586 is o.k. with EDO or FPM. The performance gain with EDO is marginal though.

Thanks for all suggestions.
As soon as I have at least 256mb of ram I will start doing tests.
I will always use two Pentiums, I do not intend to use one chip.

Mamba wrote on 2023-02-27, 10:43:

I will always use two Pentiums, I do not intend to use one chip.

That´s the spirit!

Mamba wrote on 2023-02-27, 10:43:

Thanks for all suggestions.
As soon as I have at least 256mb of ram I will start doing tests.
I will always use two Pentiums, I do not intend to use one chip.

Good luck!

There's a good chance that the i430HX chipset can handle 83MHz and the P55C CPUs almost certainly will. Juggling two at that speed might be a challenge, so I'd suggest testing with a single CPU and dual CPUs to be able to determine where your bottleneck is.

Also note that PCI runs at a fixed 1/2 divider, and 43MHz is way out of spec. There's a good chance I/O will fail before CPUs or chipset hit their max. IDE tends to be more sensitive than SCSI, but it could pay to try both if hitting limits.

majestyk wrote on 2023-02-27, 10:47:

Mamba wrote on 2023-02-27, 10:43:

I will always use two Pentiums, I do not intend to use one chip.

That´s the spirit!

Hello can you check the PMs I sent to you? Looks like you know a lot about this card.
It happens that the card I received has the multiplier dip4 electrically stuck at ON position, so I cannot have 1.5x and my 233 chips are crippled.
Any way to fix this??

Mamba wrote:

Can I change via software?

I don't think so.. but to be honest I've not tried on a pmmx. I think k6-2+/3+ is the only socket 5/7 cpu to support software multipliers

central tweaking unit is a nice program to try though (windows 9x program)

but you can also solve this with an interposer. or by modifying the cpu. or fixing the motherboard.

let me know your preference. all 3 involve soldering.

edit: after talking with Mamba in PM
this might be of interest. set multi on cpu. unfortunately this requires soldering cpu and cutting pins cutting of pins isn't normally required (though it is better), but in this case the mobo has a stuck bf DIP

Re: Socket 5/7/SS7 (Processor) Tweaker

fixing the mobo is probably the more direct solution, but here is another option that could be done outside the mobo.

Sphere478 wrote on 2023-03-10, 06:46:

I don't think so.. but to be honest I've not tried on a pmmx. I think k6-2+/3+ is the only socket 5/7 cpu to support software mu […]
Show full quote

Mamba wrote:

Can I change via software?

I don't think so.. but to be honest I've not tried on a pmmx. I think k6-2+/3+ is the only socket 5/7 cpu to support software multipliers

central tweaking unit is a nice program to try though (windows 9x program)

but you can also solve this with an interposer. or by modifying the cpu. or fixing the motherboard.

let me know your preference. all 3 involve soldering.

edit: after talking with Mamba in PM
this might be of interest. set multi on cpu. unfortunately this requires soldering cpu and cutting pins cutting of pins isn't normally required (though it is better), but in this case the mobo has a stuck bf DIP

Re: Socket 5/7/SS7 (Processor) Tweaker

fixing the mobo is probably the more direct solution, but here is another option that could be done outside the mobo.

Hello,
Thank you.
I think I have this exact problem:
233MMX in GA-586HX rev. 1.53

I would like to follow the faster route, cpu or MB to mod?
Of course the guy that would do the job for me will get paid, so the less hassle the less money I would spend…
Wish I had time and privacy to learn and do myself but I can’t at the moment…