AMD Duron 750

by Anand Lal Shimpi on September 5, 2000 12:00 PM EST

The Chip

Since the first Duron 700 we reviewed had no problem overclocking all the way up to 900MHz, there is no reason that AMD would have to make any dramatic changes to their Duron core in order to allow it to hit 750MHz.

· 25 million transistor 0.18-micron Duron core with Aluminum interconnects
· 750MHz clock speed - 7.5x clock multiplier
· 128KB on-die L1 cache running at core speed
· 64-bit exclusive 64KB on-die L2 cache running at clock speed
· 462-pin Socket A EV6 CPU interface running at 100MHz DDR (effectively 200MHz)
· 1.60v core voltage

Our original Duron sample (700MHz) was a 1.60v part, but it seems as if AMD is shipping Durons rated at 1.5v as well as 1.6v. We received an OEM Duron 700 that had a 1.5v core voltage setting, but our most recent 750MHz sample was rated at 1.60v.

With the Thunderbird being rated at between 1.70 - 1.75v, it makes sense that as the Duron increases in clock speed, its core voltage will see a similar increase until it reaches the level of the Thunderbird since it is based upon the same core but with less L2 cache.

CPU Specification Comparison
  AMD Duron
AMD Athlon
Intel Pentium III
Intel Celeron
Core
Spitfire
K7
K75
Thunderbird
Katmai
Coppermine
Mendocino
Coppermine128

Clock Speed

600 - 750 MHz
500 - 700 MHz
750 - 1100 MHz
450 - 600 MHz
500 - 1000 MHz
300 - 533 MHz
533 - 600 MHz
L1 Cache
128KB
32KB
L2 Cache
64KB
512KB
256KB
512KB
256KB
128KB
L2 Cache speed
core clock
1/2 core
2/5 or 1/3 core
core clock
1/2 core
core clock
L2 Cache bus
64-bit
256-bit
64-bit
256-bit
System Bus
100 MHz DDR (200 MHz effective) EV6
100 - 133 MHz GTL+
66 MHz GTL+
Interface
Socket-A
Slot-A
Socket-A
Slot-A (OEM only)
Slot-1
Slot-1
Socket-370
Socket-370
Manufacturing
Process
0.18 micron
0.25 micron
0.18 micron
0.25 micron
0.18 micron
0.25 micron
0.18 micron
Die Size
100mm^2
184 mm^2
102mm^2
120mm^2
128mm^2
106mm^2
153mm^2
106mm^2
Transistor Count
25 million
22 million
37 million
9.5 million
28 million
19 million
28 million

The Duron processors are still coming out of AMD's Fab25 facility in Austin, Texas since they are using Aluminum interconnects versus their high speed Copper counterparts being produced in the Fab30 plant in Dresden. It seems like Copper may be necessary for the Thunderbird/Duron core to reliably reach 1GHz and beyond, which could explain why we're only seeing 1GHz+ CPUs coming out of Dresden.

For now, all Durons are still using Aluminum interconnects and are thus being produced in AMD's Fab25 plant.

Index Overclocking & The Test

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