Chipset Guide

by Anand Lal Shimpi on August 1, 1997 9:36 PM EST
Here is an odd chipset you might've heard of in your experiences with motherboards and chipsets, the elusive VXPro chipset, found mostly in PCChips motherboards. Although it is often referred to as a cheap imitation of the Intel 430VX chipset, the VXPro does have its advantages over Intel's design, mainly dealing with cost.

The VXPro+ Chipset fully supports UltraDMA hard drives and SDRAM, unfortunately it doesn't feature the fast SDRAM timings found in the Intel TX and VIA Apollo VP2 chipsets which degrade its quality as a whole. However, the VXPro was never intended to be marketed under any labels, although the technology was apparently licensed to PCChips for use in their motherboards by VIA. VXPro chipset would appear to be loosely based on the VIA Apollo VP-1, however it seems to be a much cheaper version of it directed at entry level users. The VXPro was intended to be more of a head to head competitor of Intel's VX chipset, including features such as UMA support.

As far as most information sources goes, the VXPro chipset still limits the cacheable memory area to 64MB and unfortunately it doesn't support the maximum 2MB of L2 cache found in the superior Apollo VP-1. The VXPro chipset does however support the use of Concurrent PCI/CPU operations as well as an asynchronous PCI bus (i.e. the PCI bus can be set to 33MHz regardless of the external bus speed). The only area in which the VXPro really excels however, aside from the fact that the VXPro+ supports the UltraATA extension, is its amazing price. A motherboard built around the VXPro chipset will most likely go for about $60 which isn't bad for someone looking for an affordable solution for a second or third computer, possibly even a low cost business workstation.

VIA VXPro/VXPro+ Chipset
Common Name VXPro
Chipset Packaging Number of chips 2 (VT82C585, VT82C586)
Packaging Type 2 x 208-pin QFP
CPU Support Number of CPUs 1
AMD CPUs Supported K5, K6
Cyrix CPUs Supported 6x86 (M1), 6x86MX (M2)
Intel CPUs Supported Pentium, Pentium MMX
Cache Type Asynchronous/Synchronous Pipeline Burst Cache
Maximum Supported Size 512KB
Maximum Cacheable DRAM Area 64MB
Memory Maximum DRAM Supported 128MB
BEDO DRAM Read Timings (66MHz) N/A
EDO DRAM Read Timings (66MHz) 5-2-2-2
FPM DRAM Read Timings (66MHz) 5-3-3-3
SDRAM Read Timings (66MHz) 7-1-1-1
Data Path to Memory 64-bits
ECC Support No
Hard Disk Controller Chip VIA BMIDE Controller (VT82C586)
Busmastering Support Yes
UltraDMA Support Yes
Max. Theoretical Transfer Rate PIO Mode 5/DMA Mode 3 (33.3MB/S)
PCI Interface Supported PCI Bus Speeds 25, 30, 33 MHz
Concurrent PCI Yes
Async. PCI Bus Speed Yes
PCI Specification 2.0 (66 MHz max.)
Power Management PC97 Compliance No
Suspend to Disk No
HDD Power Down Yes
Modem Wakeup No
System Suspend No
Video AGP Support No
Unified Memory Architecture Yes
Peripheral Support USB Support Yes
Plug and Play Port Yes
Write Buffers CPU-to-DRAM Unknown
CPU-to-PCI Unknown
PCI-to-DRAM Unknown
Officially Supported Bus Speeds 50, 60, 66 MHz
Unofficially Achieved Bus Speeds 75, 83 MHz
VIA Apollo Pro
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  • vortmax2 - Wednesday, June 25, 2014 - link

    The good ole' days when you could put multiple vendor CPUs into the same motherboard. So simple...
  • PentiumGeek - Thursday, September 1, 2016 - link

    This motherboard was on my 1st PC. I was very disappointed when faced with the problem that DIMM and SIMM memory can't work in the same time. I used Pentium 100Mhz CPU on this motherboard :)
  • Amadeus777999 - Wednesday, May 9, 2018 - link

    Got an ASUS P2L97 board yesterday and I'm reading through this while DoomII is benchmarking. Good times.
  • rogerjowett - Sunday, May 17, 2020 - link

    Does n e 1 know where I can find a Voltage Regulation Module please

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