Rise mP6 PR266 socket: Super Socket 7

What the mP6 PR266 is

The Rise mP6 PR266 is a 200 MHz single-core desktop processor from October 1998. It runs one Rise mP6 Kirin core at 200 MHz with no turbo, so 1 core gives 1 thread. Cache is 16 KB of L1 with no on-die L2 on a 0.25 micron process. Power is rated at 8.54 W in a Super Socket 7 package on a 100 MHz front side bus with a 2x multiplier at 2.75 to 2.85 V.

The PR266 rating follows Pentium MMX comparisons rather than Celeron rivals, which is why the 200 MHz actual clock trails AMD K6-2 266 parts despite matching ratings. Rise launched the PR266 on October 13, 1998 at $70. The chip supports MMX with a fast pipelined FPU.

A 200 MHz actual clock on a full 100 MHz bus suits Super Socket 7 value towers with PC100 memory. The 8.54 W envelope keeps stock coolers tiny. That is why the PR266 shipped in budget home boxes.

Socket and motherboard compatibility

The PR266 fits Super Socket 7 value desktops with mP6 support. It needs a 321-pin board with a 100 MHz bus path and a BIOS that lists Rise mP6 parts. The Socket vs chipset: what decides whether a CPU works guide covers pairing rules.

Value PC100 towers are the natural match. Boards listing mP6 PR266 accept the chip with a small cooler.

Memory, PCIe and cooling

Memory is SDRAM through the board chipset, matched to the board sockets. The CPU has no memory controller. Value boards commonly run PC100 pairs.

A 100 MHz front side bus ties the CPU to the chipset, while AGP and PCI hang off the chipset. No PCIe lanes exist. Cooling uses the socket lug clip with a cooler rated for 8.54 W.

Upgrade paths

On the same socket, a Rise mP6 PR166 drops to 166 MHz actual at 7.28 W on an 83 MHz bus. An AMD K6-2 266 on the same support list runs at a true 266 MHz with 3DNow for higher throughput.

Later mP6-II and Tiger parts never launched, so the PR266 closes the retail mP6 line. The Super Socket 7 page lists the range for planning.