It's AMD K6-2 vs AMD K6-2 in an overclocking contest to see which is faster
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- Опубліковано 27 вер 2024
- Lets take 2 almost identical AMD K6-2 500MHz CPUs and pit them against each other to see which is the best overclocker. Will one come out on top, or given that these are the same CPU, will the overclocks be the same too?
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Great info on the CPU/AGP/PCI tied together.
Thanks!
even at a stable CPU overclock, sometimes the increased AGP or PCI bus speed would be unstable for some video cards. there usually wouldn't be any real performance increase either unless you were doing a lot of AGP memory transfers with big textures or something that would be bandwidth constrained. so to get around this, sometime you would purposefully get an AGP card with a nice big VRAM size to hopefully reduce any unnecessary data transfers or a card. some video cards even had ECC memory like the Quadro DCC if you bought it with the Maya package from Dell, which maybe could be more stable with an overclocked AGP bus. the highest stable AGP bus overclock i could get was 77Mhz on AGP 2.0, 4x, at 1.55V, on a K8T800 board.
Oh absolutley, if the HDD errors hadn't stopped the highest bus speed attemp, I would have expected the graphics card to, especially if I tried to run a game on it. 77MHz is a good OC you got, I can't remember seeing many that got higher than that, and if so, I'd love to know what motherboards and graphics cards were used.
Would've been interesting to see if there's any appreciable performance difference between the two after max overclock in 3Dmark2001 or something. Probably not a huge difference either way, I suppose. Still pretty interesting.
There will be some benchmark numbers in the next video when it goes up against the K6-3.
Asus P5A and the Gigabyte GA-5AX (rev 4.1 and up) are often considered the best super socket 7 boards. I didn't realize the P5A was still using jumper blocks! The GA-5AX has dip switches which is far more convenient for overclocking which edges it out for me and the fact I have a 5AX :) However I would love to add a P5A to my Asus board collection. Thanks for the video!
Im, in the opposite position, I'd love to add a GA-5AX to my collection and do some overclocking with that :) I had the GA-5AX back in the day, great motherboard, though I can't remember what revision, probably an early one. Used it with a K6-3 450Mhz for a couple of years before moving up to the Athlon. Hmmm I wonder if you can buy a little block of dip switches that slides on top of the jumper pins to switch them. If not, someone needs to invent that!
The 533MHz is a good overclocker. For over clocking disable the onboard cache. I got my FSB up to 140MHz but on board cache starts to fail from 115MHz. And then some graphics cards start to fail from 115MHz. Its fun to overclock K6, My K6 3+ is stable at 660MHz and runs for a few seconds in windows at 720MHz. This is on an air cooler.
Thats some fantastic numbers for a K6/3+! I'd love to find a 533MHz part to have a play with, but they seem so rare and expensive to get now.
My original K6-2 450 I got up to 533. At the time I was working at a local computer shop and immediately bought the 500Mhz... I could only ever run that cpu at 500Mhz... even at 533 it would crash. lol I ended up returning it and just using the 450Mhz. I had really expected more from the faster chip but at the time I think AMD was squeezing every bit from the K6-2 chips...
The K6-2s seem to have a lot of variation, there are some that barely get abve stock and some that seem to do over 600MHz without breaking a sweat. I've got a 400Mhz that won't even do 450MHz! Sometimes you win the silicone lottery and other times, you lose.
@@RetroSuperhighway indeed... Ive overclocked pretty much every generation of CPU over the years up until my current chips... now things are pretty fast out of the box and again the threshold is slimmer for overhead. Gone are the days of guaranteed 500-1000 MHz overclocks. I kept some of the golden samples for my CPU collection...
My K6-2 500 is currently running at 500 Mhz :D because PC Chips motherboard :D and te be honest, they are weak cpu, and overclocking them doesn't do much a difference to me. But i get the point, this is fun :) I also have two K6-2 400 and i wonder if one is better than the other now :D
Ah PC Chips, I'm suprised you are getting it to run at all! Glad it's working for you, overclock your 400's and see which one comes out best.
Max cpu voltage should be safe up too 2.5v according too AMD's official specifications.
Though you'll probably find a hard wall anyway regardless of voltage with the lack of decoupling of the pci & agp bus on the chipset, or if thats even possible via hardware modding a motherboard.
I myself haven't bothered really with overclocking on socket 7 or super socket 7.
Though i have added in a k6-2+ 550 mhz that runs at 400 mhz in a asus p55t2p4 motherboard at 2.1v with a larger heatsink, biggest issue i got is the 2d graphics card atm besides the lack of ram (32 mb which isnt really enough too run monster truck madness 2, half-life etc...)
Which if it runs without Vsync enabled it locks up the system entirely lol.
It's a matrox mystique 4 mb card. & for 3D it's a voodoo 1 4 mb that also came with the pc.
I'd rather have a voodoo 2 12 mb sli setup personally for the games i'd like too run but eh at least its a voodoo card.
Worst case scenario I'll run nglide or dgvoodoo, dgvoodoo2 on a patched game on windows 10.
Like Carmageddon & Splat Pack I'm running the steam version on my current gaming pc.
(Ryzen 5600 which with pbo enabled hits 4.45 ghz & a 1660 super which is idle the entire time lol.)
At 1280x960 after changing that in the nglide settings that is in the game files.
Not a super high resolution but scales textures squarely upwards for the games original high resolution mode of 640x480.
With shadows off I'm getting pretty good performance with that, has some frame stuttering issues still where it feels a bit inconsistent so not quite ironed out that yet.
(Probably just some specific racetracks.) but otherwise plays fine.
Need too sort out cd audio volume though in dosbox it's really loud...
Yeah I'm sure they would be fine with 2.5v, I was happy to keep them both stock for now to see which one won. Might go more voltage later on if needed, though I suspect we'll be on diminshing returns by them. A K6-2+ @550 from 400 is a nice OC, especially with the + CPU able to cache more RAM, definitiely sounds like it could use more than 32mb.
@@RetroSuperhighway Ah no you read that wrong heh.
It's a 550 mhz cpu but it's running at 400 mhz, originally came out of a fujitsu liteline laptop with a crushed screen that was missing a charger that i got for free.
A faster cpu clock doesn't make a difference too a voodoo 1 really + motherboard limiting that multiplier setting between 1 - 3 so setting it too 2x66 mhz fsb here is the best i can do without overclocking anything.
As AMD cleverly designed the 2 multiplier setting too mean 6x for more compatibility with older motherboards which the Asus P55T2P4 certainly is. Only have 4x edo 72 pin ram slots here.
Without a bios update (which i need too do at one point) still it thinks I'm running a very fast AMD 486 randomly.
Also a kind of neat thing is that any onboard motherboard cache is added too most of the AMD K6 cpu's as L3 cache.
Ah sorry, my bad on the misunderstanding. I see what you are saying now. Makes sense if the Voodoo is limiting factor.
Was the cpu's manufacturer's in the same country ? I've noticed CPU's from different makers clock different.
surely if one had a dot on the underside on one cpu, you wouldn't need a dot on the other one
Yeah fair point, I'll just have to swallow the ink cost for the 2nd dot :)
As i remember, i saw a video where someone enabled more cache by soldering the resistors under the heatsink to a different place. Great video, as always👍
I think that only works on a K6-2+ which was essentially a K6-3+ with half the L2 cache disabled, hence the mod. Good thread over on Vogons if you fancy a read.
@@RetroSuperhighwayoh nice, thanks for the hint🙂
Did you try the 6x multiplier?
Yep, it wont even POST at 6x.
Up the voltage a little.
Interesting, like!
Thanks!
Great Video Thank You . Every piece of Silicone is different but they did better that i expected
Thanks, they did pretty good, I'm not sure there any many that break 6000Mhz without a bit more juice or an extremely lucky sample.
The ASUS P5A Super 7 was the motherboard I used in my first PC build back in the early 90s. There was a lot of CPUs back then that were Socket 7. Intel, AMD, Cyrix, IDT Winchip. There were also Socket 7 CPU upgrade kits too. I had a CPU upgrade kit from Evergreen in a Packard Bell Platinum 2240 Tower. It upgraded the 200MHz MMX Intel CPU with an AMD K6-2 400Mhz CPU. The AMD CPU upgrade had a board connected to it with extra stuff and jumpers on it and it had to be connected to the power supply using a floppy drive connector.
Evergreen, theres a name I've not heard for a long time! Were the components on the board for power delivery to get the voltages that the K6-2 needed that the motherboard wouldn't normally have? They did a lot of upgrades for 486s too IIRC.
@@RetroSuperhighway Yes for the CPU voltage. The upgrade kit was the Evergreen Technologies Spectra 400.
Just had a quick google about it, nice board and another thing to add to the watchlist.