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Welcome to Ruston's P.C. Tech Page

"Code Names" and the processors which they represent:
P4 - Intel486 DX Processor
P24 - IntelDX2 Processor
P24C - IntelDX4 CPU (OEM version)
P24D - Write-Back enhanced IntelDX2 Processor
P24T - Pentium® OverDrive® Processor
P23T - Intel486 SX or DX OverDrive Processor
P23 - Intel486 SX Processor
P23N - Intel487 SX Processor
P5 - 5V Pentium® processor
P54C - 3.3V Pentium processor
P55C - future product
P6 - Pentium® Pro processor
Merced - future product
S - processor has "SL enhanced" power management features

New Hardware to Watch For

Accelerated Graphics Port
* (AGP) Accelerated Graphics Port A new video standard and a new way of handling
graphics on your computer's bus that boosts the speed to 133MHz
Universal Serial Bus
*(USB) Universal Serial Bus A new bus that combines the best features of a SCSI architecture
with an advanced PnP Standard. If USB delivers as advertised you won't have to worry about
bus slots, IRQ's or poking around your PC to find space for new ports. USB will support a slew
of external peripherals up to 127. Things like keyboards, monitors, scaners, modems,
video camera and digital telephones. The best part the computer will recognize and install
them on the fly.

Here is some info on Non Intel CPU's , their Bus Speeds and Multipliers

AMD K5

Processor Performance Clock Speed
(MHz)		 Bus Speed
(MHz)		 PCI Bus Speed
(MHz)		 Multiplier
K5 PR75 75 50 25 1.5
K5 PR 90 90 60 30 1.5
K5 PR 100 100 66 33 1.5
K5 PR 120 90 60 30 1.5
K5 PR133 100 66 33 1.5
K5 PR 166 116.66 66 33 1.75

As you can see, the PR120 runs at the same speed as the PR90, the PR100 runs at the same speed as the PR133. These CPUs obviously have got a different die. The PR120 and PR133 are more advanced than the PR90/100. This however only touches the integer performance. The FPU performance of the PR133 is the same as of the PR100.

Due to these strange multiplier settings, the K5 has got a fixed multiplier, which cannot be changed from out side via multiplier jumpers. The PR75 to PR133 will run at 1.5 multiplier regardless what the jumpers say, the PR166 will also always run at x1.75.

IBM 6x86 or Cyrix

Processor Performance Clock Speed
(MHz)		 Bus Speed
(MHz)		 PCI Bus Speed
(MHz)		 Multiplier Special
6x86-P200+ 150 75 37.5 or 33 2 needs special motherboard and chipset to support
75 MHz bus speed !
6x86-P166+ 133 66 33 2 no
6x86-P150+ 120 60 30 2 no
6x86-P133+ 110 55 27.5 2 needs motherboard that supports 55MHz bus speed
6x86-P120+ 100 50 25 2 no

Pentium Chipsets

The 430 HX chipset
	*also called 'Triton 2'
	*No support of SDRAM.
	*Supports up to 512 MB memory, (can be cached completely
	    as long as the motherboard is equipped with a special tag RAM chip)
	*Supports ECC.
	*Used for dual CPU
	*FPM RAM timing 5-3-3-3
	*EDO RAM timing 5-2-2-2
	*No 75 MHz Bus Speed

		The Intel 430 VX Pentium Chipset
	*No multi CPU support
	*Max. RAM only 128 MB
	*Cacheable only up to 64 MB
	*No ECC. support
	*Slow SDRAM timing of only 7-1-1-1
	*FPM RAM timing 6-3-3-3 
	*EDO RAM timing 6-2-2-2
	*No 75 MHz Bus Speed

		The Intel 430 TX Pentium Chipset
	*No multi CPU support
	*Max. RAM only 256 MB
	*Cacheable only up to 64 MB
	*No ECC. support
	*SDRAM timing of only 5-1-1-1
	*FPM RAM timing 5-3-3-3 
	*EDO RAM timing 5-2-2-2
	*New DMA/33 EIDE
	*75 MHz Bus Speed

		VIA Chipsets
		The VIA Apollo VP1 Pentium Chipset
		The VIA Apollo VP2 Pentium Chipset

	*Dual/Multi CPU Support 
	*Supports up to 512 MB memory
	*Cacheable 64 MB or 512 MB
	*ECC Support 
	*USB Support 
	*ATA-33 Extension 
	*Support AGP Support 
	*SDRAM timing of only 4-1-1-1
	*FPM RAM timing 4-2-2-2 
	*EDO RAM timing 5-2-2-2
	*75 MHz Bus Speed

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