Thermalright Ultra 90

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Heatsink Test – Joe

SUMMARY: An excellent heatsink for Intel’s hotties.

Ultra 90

Size: 45 x 102 x 147 mm; Weight: 435g (heatsink only)

The good guys at Thermalright were nice enough to send their latest heatpipe heatsink, the Ultra 90 for P4 and Intel 775 cooling for a test spin. This unit features six heatpipes in a “U” shaped configuration.

Included with the parts that ship with the unit are fan clips for a 90 mm fan:

Ultra 90

Mounting is straight forward – there are two clips which engage the P4 retention bracket. The preferred mounting procedure is to engage the two clips at the back end of the heatsink and then rock it forward to engage the retention bracket. The LGA 775 bracket is also a no-brainer – engage the socket lugs and rotate the lever arm – done.

The base is well finished; I used the Poor Man’s Flatness Test on it with good results:

Ultra 90

Rotating the base 90º:

Ultra 90

Overall the Ultra 90 is well finished and attractive.

The Test

The Thermalright HR-01 was tested on an Abit AI7 motherboard with a modified P4 Motherboard Test Platform with a modified P4 3.2E to read CPU case temps. The Ultra 90 was tested with a Delta 92 mm fan at various fan speeds to give a range of results.

TEST RESULTS – Abit AI7 Motherboard
Heatsink

CPU Case Temp

Ambient Temp

Delta

C/W

MBM Temp

Ultra 90, Delta 4739 rpm, 77 dBA²

32.3 C

19.2 C

13.1

0.13

44 C¹

Ultra 90, Delta 3512 rpm, 68 dBA²

33.1 C

18.6 C

14.5

0.14

45 C¹

Ultra 90, Delta 1989 rpm, 52 dBA²

36.4 C

20.2 C

16.2

0.16

48 C¹

¹MBM on-die temperatures.

²50 dBA measured 8″ from the fan intake corresponds to about 30 dBA measured 3 feet from the fan, a very quiet noise level.

As the test platform is different, results are not comparable to other heatsinks tested. However, I did test Thermalright’s XP-90C with the same platform with the following results:

TEST RESULTS – Abit AI7 Motherboard
Heatsink

CPU Case Temp

Ambient Temp

Delta

C/W

MBM Temp

XP-90C, Delta 4730 rpm, 77 dBA²

31.5 C

19.9 C

11.6

0.11

45 C¹

XP-90C, Delta 3460 rpm, 68 dBA²

32.5 C

19.6 C

12.9

0.12

46 C¹

XP-90C, Delta 1950 rpm, 52 dBA²

35.1 C

19.6 C

15.5

0.15

48 C¹