Socket 5
AMD K5 (PR75 - PR200)
There were two sets of K5 processors, internally called the SSA/5 and the 5k86, both released with the K5 label. The "SSA/5" line ran from 75 to 100 MHz (5K86 P75 to P100, later K5 PR-75 to PR100); the "5k86" line ran from 90 to 133 MHz. However, AMD used what it called a PR rating, or performance rating, to label the chips according to their equivalence to a Pentium of that clock speed. Thus, a 116 MHz chip from the second line was marketed as the "K5 PR166". Manufacturing delays caused the PR200's arrival to unfortunately nearly align with the release of K6. Since AMD did not want the two chips competing, the K5-PR200 only arrived in small numbers. Enthusiasts have speculated that many PR200 chips were sold as PR166, because of easy overclocking with later PR166 chips.[3]
Socket 7
AMD K6-2 (300 MHz – 550 MHz)
AMD K6-III
AMD K6-2+
AMD K6-III+
Socket 5
CPU Upgrade: voltage converter for Socket 5
Then a Socket 7 CPU
The upgrade socket from PowerLeap is compatible with most Socket 5 and Socket 7 motherboards.
The voltage for the CPU core as well as the clock multiplier can be adjusted on the upgrade socket. Voltages and timing multipliers are finely adjusted by the DIL switch on the upgrade socket.
Socket 5 - Multiplier and Clock CPU clock
3,0 x 66MHz 200MHz
2,5 x 66MHz 166MHz (Pentium 166)
2,0 x 66MHz 133MHz (Pentium 133)
1,5 x 66MHz 100MHz (Pentium 100)
1,5 x 60MHz 90MHz (Pentium 90)
1,5 x 50MHz 75MHz (Pentium 75)
Upgrade Adapter - Multiplier and Clock CPU clock
6,0 x 66MHz 400MHz (AMD K6-2/400)
5,5 x 66MHz 366MHz (AMD K6-2/366)
5,0 x 66MHz 333MHz (AMD K6-2/333)
4,5 x 66MHz 300MHz (AMD K6-2/300)
Performance comparison: Basic model vs. tuning
To measure performance, we used the Sysmark 2000 application benchmark from BAPCo as well as the Timedemo1 from the well-known Quake III Arena games benchmark. Both test procedures clearly prove that the total system performance increases considerably by using the fast AMD-CPU in conjunction with the memory upgrade. Originally the processor bus clock of a Pentium 75 is 50MHz. It is then increased to 66MHz for an AMD K6-2/400. This influences the overall performance significantly. The L2 cache and the memory are also automatically clocked at a faster rate by increasing the processor bus clock. It's just rather annoying that the processor bus clock for the Intel 430FX chipset can only be adjusted to 66MHz. Further increase of the processor bus clock to 75MHz or even 83MHz (as is offered by some boards with a 430HX chipset) would facilitate a processor core clock of 450MHz or 500MHz! And all this on a platform that is more than six years old.
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