What makes Thoroughbred's clock tick

The architectural specifications of Thoroughbred are identical to its 0.18-micron predecessor which we've written about extensively here and here. Here are some of the details of the Thoroughbred core that do set it apart from Palomino:

Thoroughbred vs. Palomino vs. Intel's Northwood
Code Name
Palomino
Thoroughbred
Northwood
Manufacturing Process
0.18-micron
0.13-micron
0.13-micron
Die Size
128 mm^2
80 mm^2
146 mm^2
(eventually 131 mm^2)
Transistor Count
37.5 Million
37.2 Million
55 Million
Voltage
1.750V
1.50V - 1.65V
1.50V
Clock Speeds
1.2 - 1.73GHz
1.47 - 1.8GHz+
1.6 - 2.53GHz+

You'll notice that there is a small decrease in transistor count when going to the Thoroughbred core. AMD was able to accomplish this by optimizing the core during the die shrink similar to what happened with the Palomino. You'll also notice that the Thoroughbred core requires much higher voltages to hit much lower clock speeds than Intel's Northwood, keep that in mind especially when we talk about the overclocking potential of the new core later on in the review.

Thermal Comparison

Processor
Model
Operating
Frequency
(MHz)
Nominal
Voltage
Typical
Thermal
Power
Maximum
Thermal
Power
Typical
Current
Working
State
Max
Current
Working
State
AXDA 1700+
1467
1.50V
44.9W
49.4W
29.9A
32.9A
AXDA 1800+
1533
46.3W
51.0W
30.9A
34.0A
AXDA 1900+
1600
47.7W
52.5W
31.8A
35.0A
AXDA 2000+
1667
1.60V
54.7W
60.3W
34.2A
37.7A
AXDA 2100+
1733
56.4W
62.1W
35.2A
38.8A
AXDA 2200+
1800
1.65V
61.7W
67.9W
37.4A
41.2A
1500+
1333
1.75V
53.8W
60W
30.8A
34.3A
1600+
1400
56.3W
62.8W
32.2A
35.9A
1700+
1467
57.4W
64W
32.8A
36.6A
1800+
1533
59.2W
66W
33.8A
37.7A
1900+
1600
60.7W
68W
34.7A
38.9A
2000+
1667
62.5W
70W
35.7A
40A
2100+
1733
64.3W
72W
36.7A
41.1A
Pentium 4
2.0A
2000
1.50V
52.4W
44.3A
2.2
2200
55.1W
47.1A
2.26
2266
56W
48A
2.40B
2400
57.8W
49.8A
2.53
2533
59.3W
51.5A

Note: AXDA denotes Thoroughbred core

The main thing to take away from this chart is that the Thoroughbred puts out around 12% less heat than an equivalently clocked Palomino core. Despite the reduction in heat dissipation the core still puts out more heat than Intel's Northwood core which is understandable because of the Athlon XP's higher IPC. You'll also notice that the Northwood draws more peak current (Intel didn't provide Max thermal power or typical current data) than the Athlon XP; it does so at a lower voltage and thus gets away with less heat.

How to spot a Thoroughbred Clock Speeds, Expectations & Motherboard Compatibility

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