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Max Cacheable Ram

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First post, by weldum

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Hello.

I have a PCChips M919 V3.4 (the one with fake "Write Back" cache chips) that works very well but I want to know what is the max cacheable ram size.

Currently it has 68MB (2x32MB EDO 60ns + 4x1MB FPM 60ns)

Also, what's the best post 94 operating system for an AMD 5x86 133MHz?

DT: R7-5800X3D/R5-3600/R3-1200/P-G5400/FX-6100/i3-3225/P-8400/D-900/K6-2_550
LT: C-N2840/A64-TK57/N2600/N455/N270/C-ULV353/PM-1.7/P4-2.6/P133
TC: Esther-1000/Esther-400/Vortex86-366
Others: Drean C64c/Czerweny Spectrum 48k/Talent MSX DPC200/M512K/MP475

Reply 1 of 7, by Skyscraper

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With a 256KB cache stick the cacheable range should be 64MB "write through" and 32MB "write back"

If you choose to run Windows 95 I would remove the 4x1MB and make sure the board runs the cache as write through . If you only use DOS and Windows 3.1/3.11 which is the period correct OS for 1994 I would probably only keep 1x32MB memory and run the cache as "write back".

New PC: i9 12900K @5GHz all cores @1.2v. MSI PRO Z690-A. 32GB DDR4 3600 CL14. 3070Ti.
Old PC: Dual Xeon X5690@4.6GHz, EVGA SR-2, 48GB DDR3R@2000MHz, Intel X25-M. GTX 980ti.
Older PC: K6-3+ 400@600MHz, PC-Chips M577, 256MB SDRAM, AWE64, Voodoo Banshee.

Reply 2 of 7, by weldum

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The problem is that I don't have any of these non-COAST sticks, and there are near zero possibilities to find one.

I have to make it work without cache sticks.

DT: R7-5800X3D/R5-3600/R3-1200/P-G5400/FX-6100/i3-3225/P-8400/D-900/K6-2_550
LT: C-N2840/A64-TK57/N2600/N455/N270/C-ULV353/PM-1.7/P4-2.6/P133
TC: Esther-1000/Esther-400/Vortex86-366
Others: Drean C64c/Czerweny Spectrum 48k/Talent MSX DPC200/M512K/MP475

Reply 3 of 7, by Skyscraper

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Then the cacheable range is 0MB, use as much memory as you like.

I would still remove the 4x1MB as they probably cant handle as tight timings as your 32MB sticks.

New PC: i9 12900K @5GHz all cores @1.2v. MSI PRO Z690-A. 32GB DDR4 3600 CL14. 3070Ti.
Old PC: Dual Xeon X5690@4.6GHz, EVGA SR-2, 48GB DDR3R@2000MHz, Intel X25-M. GTX 980ti.
Older PC: K6-3+ 400@600MHz, PC-Chips M577, 256MB SDRAM, AWE64, Voodoo Banshee.

Reply 4 of 7, by melbar

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It's a really curious board your have! Very fast chipset, but no cache or same fake's soldered onboard...
But with fast chipset + all three slot types onboard... really bad that a COAST won't work with it. Yes, i think it's hard to find the right cache.

#1 K6-2/500, #2 Athlon1200, #3 Celeron1000A, #4 A64-3700, #5 P4HT-3200, #6 P4-2800, #7 Am486DX2-66

Reply 5 of 7, by weldum

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Also, I've heard some people say the chipset auto configuration option in BIOS should be disabled to avoid performance problems.

How do I configure the memory timings? Have to do trial and error? Thanks

DT: R7-5800X3D/R5-3600/R3-1200/P-G5400/FX-6100/i3-3225/P-8400/D-900/K6-2_550
LT: C-N2840/A64-TK57/N2600/N455/N270/C-ULV353/PM-1.7/P4-2.6/P133
TC: Esther-1000/Esther-400/Vortex86-366
Others: Drean C64c/Czerweny Spectrum 48k/Talent MSX DPC200/M512K/MP475

Reply 6 of 7, by Skyscraper

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When it comes to memory timings lower numbers are usually better than higher numbers.

It is a bit of trial and error though.

New PC: i9 12900K @5GHz all cores @1.2v. MSI PRO Z690-A. 32GB DDR4 3600 CL14. 3070Ti.
Old PC: Dual Xeon X5690@4.6GHz, EVGA SR-2, 48GB DDR3R@2000MHz, Intel X25-M. GTX 980ti.
Older PC: K6-3+ 400@600MHz, PC-Chips M577, 256MB SDRAM, AWE64, Voodoo Banshee.

Reply 7 of 7, by weldum

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cachechk tells me I have 56Mb cached via L1 cache (16kb) so I put 32mb edo and windows 95 and it works much better now. Thanks to everyone.

DT: R7-5800X3D/R5-3600/R3-1200/P-G5400/FX-6100/i3-3225/P-8400/D-900/K6-2_550
LT: C-N2840/A64-TK57/N2600/N455/N270/C-ULV353/PM-1.7/P4-2.6/P133
TC: Esther-1000/Esther-400/Vortex86-366
Others: Drean C64c/Czerweny Spectrum 48k/Talent MSX DPC200/M512K/MP475

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