Want me to test idt c6? I have one of those 😀

The Cyrix 6x86 supports 1x multipliers, or at least the original Cyrix 6x86-80 I tested did. I had to set the motherboard to 4x to get the CPU to run at 1x. I ran it at 1.0 x 75 and 1.0 x 83 as part of the Ultimate 6x86 Benchmark Comparison (in progress / on hold). So if you ran it at 1.0 x 50 MHz, I think this would be the slowest socket 7 CPU configuration available without modifying the motherboard's clock generator for sub-50 MHz speeds.

A 6x86-80 is still damn speedy at Zdoom (i've tested a Cyrix 6x86MX at that speed before years ago), so slowest FPU it isn't IMO

of course I could (and should) be proven wrong, I believe K5 could take the 'slowest s7' cake.

80 MHz is quite a bit faster than 50 MHz. My understanding is that we aren't looking for the slowest clock-for-clock socket 7 FPU, but the slowest FPU possible on a socket 7. The main take-away message as that the 6x86 can run at 50 MHz. Can the K5, or others, run at 1.0X at 50 MHz? The original 6x86 is non-MMX.

Is zDoom highly FPU intensive? The original DOOM was mainly, or entirely, ALU demanding, though I'm not familiar with testing zDoom.

If there is enough interest in this, I could do a slow-moe show-down between the Cyrix 6x86-50 and any other socket 7 you think can run at 50 MHz.

feipoa wrote:

The Cyrix 6x86 supports 1x multipliers, or at least the original Cyrix 6x86-80 I tested did. I had to set the motherboard to 4x to get the CPU to run at 1x. I ran it at 1.0 x 75 and 1.0 x 83 as part of the Ultimate 6x86 Benchmark Comparison (in progress / on hold). So if you ran it at 1.0 x 50 MHz, I think this would be the slowest socket 7 CPU configuration available without modifying the motherboard's clock generator for sub-50 MHz speeds.

I've gone lower but most boards don't support lower clocks and the few that do don't advertise them. I did manage to get a p1 to run around 20mhz or so and took close to a min just to post. I discovered the setting when trying to figure if it supported higher fsb clocks on a older oem Gateway board (socket 5) that was using the Intel FX series chipset which was before HX and VX era. Sadly it was one of the boards that I lost and worse a K6 with the big logo was installed just before the move 😢

The oddest board that I have worked with besides a Media GX build was a Compaq that used the rare Opti Viper chipset.

I'm currently running a 240MHz rated C6 at 133MHz on my dos gaming machine (with FSB slightly overclocked to 66MHz , motherboard does not support 60FSB or is not documented) and have a Cyrix PR200 that posted PR75 too (I don't have a clue FSB or multiplier) on the same board.
Maybe I'll measure the FSB scalling for both.

How would you test FPU performance alone? SuperPi?

I'm no good at benchmarking, so some recommendations are in demand. Was thinking to use speedsys...

superpi is one of the recognized fpu benchmarks, quake would do aswell.

wonder how engoo would be torture on them with the colored lighting code, since most of the assembly (but not all) was dropped

i have scored a whopping 0.5fps in quake3 on a 6x86-66!
don't have any idt c6 atm though.

Per HDMI bekommt man glaube ich automatisch diese frequenzen. Schwierigier ist es per DVI. Da muss man eigene Aufloesungen erstellen.

Aren't there boards that support 40MHz bus?

sliderider wrote:

How would you test FPU performance alone? SuperPi?

What about Landmark? It has seperate scores for ALU and FPU.

What about the classic Whetstone Benchmark?
http://www.roylongbottom.org.uk/whetstone%20results.htm

Anonymous Coward wrote:

Aren't there boards that support 40MHz bus?

maybe they exist but i havn't seen any. after all, there seemed to be no pentium or k5 officially rated for 40fsb, only cyrix has one model rated 40*2.

elianda wrote:

What about the classic Whetstone Benchmark?
http://www.roylongbottom.org.uk/whetstone%20results.htm

Winchip C6 200MHz 40.6 16.9 12.3 7.81 1.02 0.71 18.4 28.4 17.0
Pentium 200 200MHz 132.0 54.2 34.7 20.3 5.12 3.03 32.5 39.8 46.2

😈

I know of one board that does 40MHz: Shuttle HOT 553

Filosofia wrote:

Winchip C6 200MHz 40.6 16.9 12.3 7.81 1.02 0.71 18.4 28.4 17.0 Pentium 200 200MHz 132.0 54.2 34 […]
Show full quote

elianda wrote:

What about the classic Whetstone Benchmark?
http://www.roylongbottom.org.uk/whetstone%20results.htm

Winchip C6 200MHz 40.6 16.9 12.3 7.81 1.02 0.71 18.4 28.4 17.0
Pentium 200 200MHz 132.0 54.2 34.7 20.3 5.12 3.03 32.5 39.8 46.2

😈

this benchmark is obvious theoretical. that is, only the sole fpu and no cache/ram were involved, which would not correctly represent the actual performance.
for example, celeron733 scores higher than pentium3-700, which is undoubtedly a joke. all pentium4 series score incredibly low in the table aswell, their real life performance may be bad but not to that extend.
for me, superpi is a more realistic fpu&cache&ram benchmark, and is more related to actual performance.