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So, like, does the K6 3+ 550mhz really exist?

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Reply 100 of 104, by Sphere478

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Tetrium wrote on 2022-06-06, 12:05:
Sphere478 wrote on 2022-06-06, 09:14:
cskamacska wrote on 2022-06-06, 08:26:

With Socket 7 systems your practically not even overclocking. Since even late motherboards need jumpers or DIP switches to set the multiplier, FSB, and core voltage, the board doesnt even know what the rated speed was in the first place. So paying top dollars for an 550MHz part instead of getting a mobile version far cheaper is just pure dick swinging and feeding the OCD monster.

The 570s have been showing very good yeilds and are usually cheaper than the low voltage variants. There have been even a few cases of north of 650mhz on air with some of them. They are imho the most common sense socket 7 performance purchase at the moment. The mod is required though. But It’s not too hard if you follow the guide.

Some people are even upgrading them to liquid metal with a athalon IHS

I think you meant Athlon? Athlons don't have IHSs though, they come with a naked die. Or you meant A64?

Yes, sorry spelled it wrong. Check out the guide, it shows what I'm talking about. Probably Athlon 64, yes.
Re: SUCCESSFUL K6-2+ to K6-3+ Full Cache Enable Mod

Sphere's PCB projects.
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Sphere’s socket 5/7 cpu collection.
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SUCCESSFUL K6-2+ to K6-3+ Full Cache Enable Mod
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Tyan S1564S to S1564D single to dual processor conversion (also s1563 and s1562)

Reply 101 of 104, by RaiderOfLostVoodoo

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cskamacska wrote on 2022-06-06, 08:26:

Basically this. A lot of the times overclocking can get you to the effective limit of the last processor stepping of the architecture.

Not if you use the bottom of the barrel variants.
The low voltage variants (400ATZ/400ITZ@1.6V + 450APZ@1.7V + 500ANZ@1.8V) are of high binning quality, just like the 550ACR and the voltage/clock settings are interchangeable between those. You're probably not gonna hit those specs with a 400ACR or 450ACR (both 2.0V). With a 500ACR maybe.

The low voltage variants used to be an insider tip and were still available for 10 bucks or so a few years ago. But word spread and they eventually sold out, so the price climbed to 100 bucks.
Sadly I got into the boat too late, but I got really lucky with mine. Asus P/I-P55T2P4, K6-III+ 400ATZ, 4x32MB EDO, S3 Trio64, FSP AT PSU, HDD, DVD, Floppy and an AT desktop case (which sadly was spraypainted in black) for just 100 bucks shipped. The same day a naked 400ATZ was auctioned of for 105€ shipped. I really don't understood it. xD Previous owner used to run it with 400MHz@2.0V via a modded BIOS.
That was only weeks before the K6-2+ mod was discovered, but I'm not mad. I have use for the other components as well. Put a Pentium MMX in it and am using this machine now to test ISA cards. Don't want to risk my valuable SS7 board.

cskamacska wrote on 2022-06-06, 08:26:

With Socket 7 systems your practically not even overclocking. Since even late motherboards need jumpers or DIP switches to set the multiplier, FSB, and core voltage, the board doesnt even know what the rated speed was in the first place. So paying top dollars for an 550MHz part instead of getting a mobile version far cheaper is just pure dick swinging and feeding the OCD monster.

The 550ACR is a mobile CPU as well. All the K6-III+ and K6-2+ are in fact mobile CPUs. That's why you can change the clockspeed via SetMul on the fly.

Reply 102 of 104, by NostalgicAslinger

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RaiderOfLostVoodoo wrote on 2022-06-06, 14:00:

Not if you use the bottom of the barrel variants.
The low voltage variants (400ATZ/400ITZ@1.6V + 450APZ@1.7V + 500ANZ@1.8V) are of high binning quality, just like the 550ACR and the voltage/clock settings are interchangeable between those. You're probably not gonna hit those specs with a 400ACR or 450ACR (both 2.0V). With a 500ACR maybe.

I have a 500 ANZ and 400 ACR. The 500 ANZ runs flawlessly (prime stable) with 550 MHz/1.8V and 600 MHz/1.95V. The 400 ACR needs 2.2V for 550 MHz (2.1V is not 100% stable), so yes, the yield quality for the low voltage chips should be much better.

Reply 103 of 104, by RaiderOfLostVoodoo

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NostalgicAslinger wrote on 2022-06-06, 17:35:

I have a 500 ANZ and 400 ACR. The 500 ANZ runs flawlessly (prime stable) with 550 MHz/1.8V and 600 MHz/1.95V. The 400 ACR needs 2.2V for 550 MHz (2.1V is not 100% stable), so yes, the yield quality for the low voltage chips should be much better.

Just like expected.

My buddy Hirsch and I ordered 9 pieces of the 570ACZ. 8 of these were not able to pull off 600MHz@2.0V. They needed a bump to 2.05V, even before modding. One was able to pull off 600MHz@1.85V. With full cache enabled they'll probably need another 0.05V bump.
Quality of those seems to bit a little bit lower than the 550ACR or the low voltage variants. Still the best bang for the buck and much better than a 400ACR.

Reply 104 of 104, by Sphere478

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RaiderOfLostVoodoo wrote on 2022-06-06, 22:58:
Just like expected. […]
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NostalgicAslinger wrote on 2022-06-06, 17:35:

I have a 500 ANZ and 400 ACR. The 500 ANZ runs flawlessly (prime stable) with 550 MHz/1.8V and 600 MHz/1.95V. The 400 ACR needs 2.2V for 550 MHz (2.1V is not 100% stable), so yes, the yield quality for the low voltage chips should be much better.

Just like expected.

My buddy Hirsch and I ordered 9 pieces of the 570ACZ. 8 of these were not able to pull off 600MHz@2.0V. They needed a bump to 2.05V, even before modding. One was able to pull off 600MHz@1.85V. With full cache enabled they'll probably need another 0.05V bump.
Quality of those seems to bit a little bit lower than the 550ACR or the low voltage variants. Still the best bang for the buck and much better than a 400ACR.

Try them in a different mobo. May be time for capacitors?

Sphere's PCB projects.
-
Sphere’s socket 5/7 cpu collection.
-
SUCCESSFUL K6-2+ to K6-3+ Full Cache Enable Mod
-
Tyan S1564S to S1564D single to dual processor conversion (also s1563 and s1562)