Overclocking oooold processors... help!

[Mosmi]

I've been given the remnants of one 133Mhz PC, and a complete 90Mhz PC, with 64Mb of RAM. To the best of my knowledge, the complete 90Mhz one was built around '97..

Would it be viable to put the 133Mhz processor into the complete PC, and then overclock it?

Thanks for any help > http://www.sysopt.com/forum/smile.gif

[Richard_Cranium72]

You can put the 133 in the other one if they are both Pentium style socket 5 or 7

But, a faster and cheap method is to install a much faster processor..

If the mobo has a voltage jumper marked "VRE" it may allow the use of a 400 socket 7 such as the AMD400 or the $35 450 at tigerdirect.

The CPU voltages range from about 2.0-2.4

The VRE stuff is for dual voltage to allow the CPU to run at a diff voltage than the memory and i/o cards.

Get the 400 AMD processor and set the jumpers for 2x

The CPU sees this as a 6x
If the mobo is a 66mhz fsb, this will be 400mhz
If you have a setting for 75mhz fsb, this will be 450mhz

[Ed_S]

Even if the board will accept the 133, you probably won't be overclocking it! Most Intel P133's were multiplier-locked anyway!

Doc's giving you good advise, more details on using a K6-400 in older boards can be found here (http://www.romulus2.com/articles/guides/newlife/newlife.htm) .

[RoadWarrior]

C0 stepping of the P90-100 had a 2x multiplier on it, so you can run these at 120 -133 well cooled. The 133 is limited to 2x but I had one running nice at 166 with the bus speed set to 83. Set like this you get P200 level performance.

[samwichse]

Is an IBM 6x86 150mhz a dual or single voltage processor? If it's dual, then couldn't I get a K6-2 or K6-3+ to pop in an older board for 6*66 (or mabye 6*75) like is shown in your link? Also, is that the same thing as a Cyrix?

[Mosmi]

Thanks http://www.sysopt.com/forum/smile.gif I'll investigate the AMD400 further!

[Konan555]

Locked 133? I was under the impression that they only started locking in the mid-range P2's

The p133's I've used (socket 7) have all been unlocked and quite happy with 166MHz on stock cooling.

[Mosmi]

I've got an update on the motherboard that I'd like to put a new processor in. It's an Asus P/I-P55TP4N, which can be found here. (http://www.asus.com.tw/products/motherboard/pentium/p55tp4n/index.html)

Is it still possible to use a K6 400 with it?

[Peter M]

The old Pentiums up to 133 weren't "locked", it's just that they were designed to have 1.5x and 2.0x choices only - available on a single multiplier select jumper. The second jumper for the higher multipliers was added later, when the 150 to 200 MHz speed grades were introduced (however, there are 133 MHz ones from that later type that "know" about the higher multipliers).

As for the old ASUS board, no way. This has CPU voltage regulators that are way too weak for feeding a K6-2, and even too weak for a Cyrix MII-300. From my memory, it doesn't even have split-voltage support, so all it takes is a non-MMX Pentium-200.

Regards, Peter

[DanU]

I took a look at the specs. It doesn't look like this board supports split voltage, so even hacking the regulators isn't an option. You're going to be stuck with a single voltage chip. The fastest single voltage chip I can think of was the non-mmx p200... no wait... there's also the winchip-2 240.

You might be able to use a powerleap adapter and a K6-2, 2+, 3, or 3+ at 400MHz, but the adapters are very expensive. It's probably cheaper to get a SS7 board that natively supports the K6 series of CPUs.