Dr Thermal TI-V77

Moderate performance, moderately low noise — Joe

SUMMARY: OK for moderately aggressive Socket A/370 cooling.


Size: 74 x 74 x 46mm; Fan 33 cfm @ 3800 rpm.

Dr Thermal was nice enough to send a sample of their Dr Thermal TI-V77 Socket A/370 heatsink. This is an aluminum radial fin/copper plug design. The base


Note the CPU core contact patch.

features a copper plug insert for increased cooling effectiveness. The base on the sample I had was not finished flush to the aluminum base – it was raised very slightly above it so that CPU contact with the surrounding aluminum base was not optimal, although only a small portion was not contacting the copper plug (this is characteristic of almost all Socket A/370 heatsinks using a symmetrical radial fin design).

The fan is an YS Tech Model #FD1270157B-1F; a 70 x 15mm unit rated at 36.5 cfm @ 5000 rpm (this sample ran at 5619 rpm). I found it to be not too noisy – I measured its noise at 64 dBA with a Radio Shack sound meter 8″ from the fan’s intake, less than a Delta 38 (about 69 dBA); YS Tech specs the noise at 40 dBA. It consumes about 3.1 watts, so it should be OK to use a motherboard fan header.

Mounting is its best feature – with the lever in the “up” position, engage the retention base; then swing the clip closed and it’s firmly mounted – easy, simple, very effective and not a problem to mount in a crowded case.

In summary, a fairly conventional aluminum/copper plug heatsink with one of the easiest and secure socket mounting systems around.


The TI-V77 was first tested on the CPU Die Simulator which gives results that are unaffected by motherboard influences. I then tested it on an Iwill KK266+, modified to read AMD CPU die temps, as an example of what users might see on their systems.


Die Temp
Ambient Temp
49.8 C
23.8 C
26.0 C

TEST RESULTS – Motherboard

CPU Die Temp

Ambient Temp



CPU Back Temp

Palomino 1200, Iwill KK266+

39.2 C

24.2 C



42.2 C

Delta = CPU temp – Ambient Temp
C/W = Delta / CPU Watts

Interpreting C/W: For every watt (CPUw) that the CPU
consumes, the HSF will limit the CPU’s temperature rise to (C/W x CPUw)
plus the temperature at the HSF’s fan inlet. For example, at an ambient temp of 25 C, a C/W of 0.25 with a CPU radiating 50 watts means that CPU temp will increase 50 x 0.25 = 12.5 C over ambient temp, or 37.5 C. The lower the C/W, the better.

CPU Die Simulator results place the TI-V77 in the mid rank of heatsinks (Heatsink Ranking).


OK for moderately aggressive Socket A/370 cooling – relatively quiet.

Thanks again to Dr Thermal for sending this our way.

Email Joe

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