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For other uses, see mP 6 (disambiguation).

This article is about the mP6 microprocessor.

Rise mP6
KL Rise MP6 266.jpg
The Rise Technology mP6 microprocessor, the 387-ball BGA package mounted on a 296-pin Socket 7 PPGA adapter.
Produced From 1998 to 1999
Marketed by Rise Technology
Designed by Rise Technology
Common manufacturer(s)
Max. CPU clock rate 166 MHz to 250 MHz
FSB speeds 83 MT/s to 100 MT/s
Min. feature size 0.25 µm to 0.18 µm
Instruction set x86 (IA-32)
Microarchitecture 8-stage (integer)/4-stage (Floating point), triple pipelined design
CPUID code 00000504 (Kirin)
00000521 (Lynx)[2]
Product code 6441
Cores 1
L1 cache 16 KiB
L2 cache Motherboard dependent
L3 cache none
Successor Rise mP6-II
Core name(s)
  • Kirin
  • Lynx

The Rise mP6 was a superpipelined and superscalar[3] microprocessor designed by Rise Technology to compete with the Intel Pentium line.


Rise Technology had spent 5 years developing a x86 compatible microprocessor,[4] and finally introduced it in November 1998 as a low-cost, low-power alternative for the Super Socket 7 platform, that allowed for higher Front-side bus speeds than the previous Socket 7 and that made it possible for other CPU manufacturers to keep competing against Intel, that had moved to the Slot 1 platform.


The mP6 made use of the MMX instruction set and had three MMX pipelines which allowed the CPU to execute up to three MMX instructions in a single cycle. Its three integer units made it possible to execute three integer instructions in a single cycle as well and the fully pipelined floating point unit could execute up to two floating-point instructions per cycle. To further improve the performance the core utilized branch prediction and a number of techniques to resolve data dependency conflicts.[3] According to Rise, the mP6 should perform almost as fast as Intel Pentium II at the same frequencies.[5]


Despite its innovative features, the real-life performance of the mP6 proved disappointing. This was mainly due to the small L1 Cache.[5] Another reason was that the Rise mP6's PR 266 rating was based upon the old Intel Pentium MMX,[5] while its main competitors were the Intel Celeron 266, the IDT WinChip 2-266 and the AMD K6-2 266, that all delivered more performance in most benchmarks and applications.[5] The Celeron and the K6-2 actually worked at 266 MHz, and the WinChip 2's PR rating was based upon the performance of its AMD opponent.[5]


Announced in 1998, the chip never achieved widespread use,[citation needed] and Rise quietly exited the market in December of the following year.

Like competitors Cyrix and IDT, Rise found it was unable to compete with Intel and AMD.


A Vortex86DX

Silicon Integrated Systems (SiS) licensed the mP6 technology, and used it in the SiS 550, a system-on-a-chip (SoC) that integrated the mP6 CPU, the north and south bridges, and sound and video on a single chip. The SiS 550 saw use in some compact PCs and in consumer devices, such as DVD players. The SiS 551 chip was also marketed by DM&P as Vortex86 (M6127D).

Later DM&P took over mP6 design from SiS and continues development under Vortex86 SoC product line.

DM&P further signed an agreement with Xcore to allow them to rebrand the chip as Xcore86.[6]

mP6 data[edit]

The various models of the Rise mP6 with their PR rating, data from[3][5]
Model number Frequency L1 Cache FSB Mult. Voltage TDP Socket Release date Part number(s) sSpec number Introduction price
PR 166 166 MHz 8 (data) +
8 (instructions) KB
83 MT/s 2x 2.75–2.85 V 7.28 W Super Socket 7
BGA 387
PPGA 296
13 October 1998 MP6441RPFE4-Q $50
PR 233 190 MHz 8 (data) +
8 (instructions) KB
95 MT/s 2x 2.75–2.85 V 8.11 W Super Socket 7
BGA 387
PPGA 296
13 October 1998
PR 266 200 MHz 8 (data) +
8 (instructions) KB
100 MT/s 2x 2.75–2.85 V 8.54 W Super Socket 7
BGA 387
PPGA 296
13 October 1998 MP6441DPFH4-Q
PR 333 240 MHz 8 (data) +
8 (instructions) KB
95 MT/s 2.5x 2 V 10.18 W Super Socket 7
BGA 387
PPGA 296
26 May 1999
Samples only
PR 366[7] 250 MHz 8 (data) +
8 (instructions) KB
100 MT/s 2.5x 2 V 10.72 W Super Socket 7
BGA 387
PPGA 296
26 May 1999
Samples only


  1. ^ "32 BITS: SUPERSCALAR: 4.26. Rise iDragon mP6". Retrieved 3 November 2011. 
  2. ^ "x86, x64 Instruction Latency, Memory Latency and CPUID dumps". 22 October 2011. Retrieved 3 November 2011. 
  3. ^ a b c Shvets, Gennadiy (8 October 2011). "Rise Technology MP6 family". CPU World. Retrieved 1 November 2011. 
  4. ^ "Rise mP6". Retrieved 1 November 2011. 
  5. ^ a b c d e f Gravrichenkov, Ilya (15 May 1999). "Rise mP6 266 Review". X-bit Laboratories. Retrieved 1 November 2011. 
  6. ^ Xcore Corporation Ltd. has entered into an agreement with DMP Electronics Inc.
  7. ^ Shvets, Gennadiy (8 October 2011). "Rise Technology MP6 PR 366". CPU World. Retrieved 1 November 2011. 

External links[edit]