x86 cpus' Guide

 Search (OK)


Collections : 21050  cpu
Known : 10338  cpu
For sale : 237  cpu
Pictures : 25565  photos
 Add to favorites
Site map Site map

Franc¸ais  English  Dutch   

 Log in

Processor of the day

Intel Xeon 550 (1M)

Most popular CPUs

Intel Core 2 Duo E8800 (ES)
Intel Core 2 Duo E6200 (ES)
Intel Core 2 Duo E7700
Intel Core 2 Duo E7800
Intel Pentium II 266 (0,35µ)

Intel Core i7-3770
Intel Core i5-3470
Intel Core i5-2400
Intel Core i5-4570
Intel Core i7-2600

Most powerful CPUs
Desktop PCs
AMD : Ryzen Threadripper PRO 3995X
Intel : Core i9-10980XE
Laptop PCs
AMD : Ryzen 9 4900H
Intel : Core i9-10980HK
Intel : Xeon Platinium 9282

NexGen > FPUs > Nx587


Models (list)
From collector's point of view


The design of the Nx586 had begun in the days of the 386. The separate coprocessor was the most normal thing in the CPU business back then. But things changed and by the time Intel released the Pentium, everybody had forgotten about those days.
While NexGen's CPU performed very well against the Pentium, its roots in the old were very visible : the coprocessor solution was a separate chip!

The Nx587 was designed as a separate chip because of design complexities and limitations of manufacturing processes. Its development was very difficult and problems in the design phase resulted in many delays.
NexGen wanted to focus on the development of the CPU and outsourced the development of the FPU to Chips & Technologies. Unfortunately C&T could not deliver a FPU in the agreed timeframe and NexGen took the development back in-house. Only with the greatest effort NexGen completed the design, but the production of the Nx586 had already started. With no time to spare, NexGen launched its Nx586 without the coprocessor option.

NexGen put the Nx587 in production but by the time the first FPU's were ready, the situation had changed drastically. Many Nx586 chips and motherboards had already been shipped. NexGen's resources were stretched to the maximum and it could not afford to diversify its productline with new motherboards with coprocessor sockets. NexGen decided that the separate FPU would not be released. Instead it continued to sell the coprocessor-less Nx586 and launched the Nx586FP. This chip was packaged in a Multi Chip Module which housed a separate CPU and separate FPU.

When AMD bought NexGen it used the Nx587 in its next generation CPU, the K6. While integer performance of the K6 was more than a math for Intel's Pentium, the floating point performance was just not good enough to beat it. The reason was, as we know now, that the K6 had a coprocessor designed for a CPU generation back !