How is such a 486 DX4 processor mutlpler made?
Originally it is described as multipler x3.
If I can switch it to multipler 2 could be great. On Host Bus 66 MHz will give 133 MHz. True DX4.
Route 66 MHz😎
BitWrangler wrote on 2024-09-22, 14:03:Running a DX2 at 66 bus, you need one of two DX2s, an AMD or Intel with a 16kb cache that have been down marked from DX4 production. Well not really one, more like several, because not all of them might make the 2x50 step, then out of those, small proportion achieve 2x60, then an even smaller proportion 2x66
Not sure about Intel parts, but AMD 5x86 rebadged into DX2 16kb parts are solid at overclocking. 133 won't be an issue, they were tested to work at 66MHz without any cooling in various embedded devices.
I must be some kind of standard: the anonymous gangbanger of the 21st century.
BitWrangler wrote on 2024-09-22, 18:02:Yes it's probably a lot easier to find DX4s with 2x than the couple of percent DX2 culls from those and hope they go high.
I feel like the Cyrix/IBM/ST/TI are ignorable though since I don't hear much about them overclocking past 100, though I think I heard something about the TI ones being made maybe a skooch better and maybe capable of 120.
Actually, the IBM labeled variant of the Cyrix 5x86 is the fastest of the bunch clock for clock, I have not had a 100mhz part yet that wouldn't run at 2x60, whereas only around 1 in 30 am5x86 will run at 180. With the cyrix activating the special instructions will get you further. Cyrix is second, and ST and TI are rejects comapritively.
The reason why you don't see many people using the IBM is mainly cost (now around $90 a pop opposed to a am5x86 at like $20) and also compatibility/ complexity that may put some off.
Check out Feipoa's thread "so you want a cyrix 133"
MikeSG wrote on 2024-09-20, 14:37:Well a 128-bit TNT2 Ultra could run Quake 3 at a playable framerate, where a 64-bit TNT2 M64 couldn't.
So it's an interesting test for a POD-83 if it was installed in a new 486 motherboard supporting 1x AGP.
Would I spend 1-2 years building & designing a new 486 motherboard to do this... no.
Except a POD would not be a candidate anyway- the highest bus it will run is 40mhz, and even that is often achievable only after modifying the on chip VRM for higher voltage. In my tests it by far got beat with am/cx running at 60mhz, aside from the few Pentium optimized games obviously (and even there it was a little disappointing)
For a while, I thought it would be cool to see a 386 board with PCI but that never happened either.
bertrammatrix wrote on 2024-09-22, 19:47:Actually, the IBM labeled variant of the Cyrix 5x86 is the fastest of the bunch clock for clock, I have not had a 100mhz part ye […]
BitWrangler wrote on 2024-09-22, 18:02:Yes it's probably a lot easier to find DX4s with 2x than the couple of percent DX2 culls from those and hope they go high.
I feel like the Cyrix/IBM/ST/TI are ignorable though since I don't hear much about them overclocking past 100, though I think I heard something about the TI ones being made maybe a skooch better and maybe capable of 120.
Actually, the IBM labeled variant of the Cyrix 5x86 is the fastest of the bunch clock for clock, I have not had a 100mhz part yet that wouldn't run at 2x60, whereas only around 1 in 30 am5x86 will run at 180. With the cyrix activating the special instructions will get you further. Cyrix is second, and ST and TI are rejects comapritively.
The reason why you don't see many people using the IBM is mainly cost (now around $90 a pop opposed to a am5x86 at like $20) and also compatibility/ complexity that may put some off.
Check out Feipoa's thread "so you want a cyrix 133"
Sorry gonna have to pull your geek card, you actuallied a post about DX4s with a different CPU
Unicorn herding operations are proceeding, but all the totes of hens teeth and barrels of rocking horse poop give them plenty of hiding spots.
BitWrangler wrote on 2024-09-22, 21:00:bertrammatrix wrote on 2024-09-22, 19:47:Actually, the IBM labeled variant of the Cyrix 5x86 is the fastest of the bunch clock for clock, I have not had a 100mhz part ye […]
BitWrangler wrote on 2024-09-22, 18:02:Yes it's probably a lot easier to find DX4s with 2x than the couple of percent DX2 culls from those and hope they go high.
I feel like the Cyrix/IBM/ST/TI are ignorable though since I don't hear much about them overclocking past 100, though I think I heard something about the TI ones being made maybe a skooch better and maybe capable of 120.
Actually, the IBM labeled variant of the Cyrix 5x86 is the fastest of the bunch clock for clock, I have not had a 100mhz part yet that wouldn't run at 2x60, whereas only around 1 in 30 am5x86 will run at 180. With the cyrix activating the special instructions will get you further. Cyrix is second, and ST and TI are rejects comapritively.
The reason why you don't see many people using the IBM is mainly cost (now around $90 a pop opposed to a am5x86 at like $20) and also compatibility/ complexity that may put some off.
Check out Feipoa's thread "so you want a cyrix 133"
Sorry gonna have to pull your geek card, you actuallied a post about DX4s with a different CPU
Ah you meant only the DX4 variant of cx... I didn't think anyone would even consider those hence I assumed you mean the 5x86s.... they were always considerably slower then Intel/AMD and I've never heard of any success stories running those at fast FSBs...or overclocks at all for that matter
For several previously mentioned reasons, the best choice for me turns out to be Pentium 133 MHz multipler 2 on Host Bus 66 MHz. Original board should contain AGP x2 and Ultra ATA-66 controller. Unfortunately, without VESA.
Maybe I'll buy the original DX2 with VESA as another computer anyway.
Route 66 MHz😎
Tymo486DX2 wrote on 2024-09-23, 00:08:For several previously mentioned reasons, the best choice for me turns out to be Pentium 133 MHz multipler 2 on Host Bus 66 MHz...
Oh!
Now I am thinking about mainboards with Socket 7
Route 66 MHz😎
Tymo486DX2 wrote on 2024-09-26, 08:53:Now I am thinking about mainboards with Socket 7 […]
Now I am thinking about mainboards with Socket 7
I guess this fits better in a new topic.
Yes, indeed.
Route 66 MHz😎
