The HD7900 series heatsink are designed to cool surface mount components (memory, and mosfets) on AMD® Radeon™ HD 7970 and HD 7950 reference board design graphics cards which Brand Models are listed hereafter.  Due to the differences in PCB design between the HD 7970 and 7950, two specific models are available:  the HD7970-HS and HD7950-HS

 

The Heatsinks are designed to be installed in conjunction with our MCW82-7900 VGA waterblocks and to allow stable overclocks while keeping the cards cool and silent.

The performance advantage of  hybrid cooling which consists in cooling the processor with a GPU waterblock in combination with a heatsink, as opposed to using a full-cover water-block solution, is well known among enthusiast users: improved thermal dissipation at the GPU level thanks to Swiftech's Diamond Pin Matrix, a more reliable TIM joint, and less heat dumped into the liquid cooling loop coming from memory and power MOSFETS, since they remain air cooled. In addition, this combination provides a complete solution that is more economical than full-cover waterblocks because the GPU waterblock can be re-used over time with different VGA cards.

 

The heatsinks are a precision CNC machined Aluminum extrusions, and they are designed to allow optimum TIM joints with the hottest components. Thermal pads are pre-applied onto the pedestals corresponding to each component to be cooled. Lastly, the heatsink feature mounting holes to install an optional 60mm fan to provide additional cooling for users who perform extreme voltage modifications.

 

All tests were conducted at 23°C +/- 0.5°C ambient - GPU cooled by MCW82-7900 - Liquid Cooling system:  MCR320-Drive with 1800 rpm fans.

 

A first series of tests using the Unigine Heaven benchmark is representative of conditions found in a typical gaming scenario. Two operating conditions were tested: at stock frequency & voltage, and at maximum stable overclock & stock voltage.

 

Unigine Heaven @ stock speed & voltage	GPU frequency Mhz	GPU Temp °C	VR1 Temp °C	VR2 Temp °C	Fan speed rpm	Subjective noise level	Link to test
Reference cooler	925	78	64	56	2417	Low
MCW82-7900 + 7970-HS no fan	925	37	60	57	n/a	None
MCW82-7900 + 7970-HS with fan	925	37	51	48	1500	Whisper
Unigine Heaven @ Max OC & stock voltage	GPU frequency Mhz	GPU Temp °C	VR1 Temp °C	VR2 Temp °C	Fan speed rpm	Subjective noise level	Link to test
Reference cooler	1150	81	71	60	2565	Low
MCW82-7900 + 7970-HS with fan	1190	38	54	50	1500	Whisper

 

A second series of tests using the Furmark benchmark is representative of artificially high loads not usually encountered in typical gaming (real life) situations. The tests are nonetheless presented as worse case scenarios. Two operating conditions were tested: at stock frequency & voltage, and at maximum stable overclock & stock voltage.

 

Furmark @ stock speed & voltage	GPU frequency Mhz	GPU Temp °C	VR1 Temp °C	VR2 Temp °C	Fan speed rpm	Subjective noise level	Link to test
Reference cooler	925	86	88	67	3051	Noticeable
MCW82-7900 + 7970-HS no fan	925	45	98	87	n/a	None
MCW82-7900 + 7970-HS with fan	925	44	77	66	1500	Whisper
Furmark @ Max OC & stock voltage	GPU frequency Mhz	GPU Temp °C	VR1 Temp °C	VR2 Temp °C	Fan speed rpm	Subjective noise level	Link to test
Reference cooler	1150	90	100	72	3382	High
MCW82-7900 + 7970-HS with fan	1190	46	92	75	1500	Whisper

 

 

• Material: black anodized aluminum extrusion
• Dimensions (Inch): 9.5" (L) x 3.7" (W) x .73" (H)
• Dimensions (Metric): 242 (L) x 94mm (W) x 18.5 mm (H)
• Weight: 12 oz (338 g)
• Installation: high thermal conductivity 0.5mm pads for memory and power mosfets
• Pre-existing mount holes for optional 80x15mm fan

 

 

 

 

Here is an example showing a PCB number 109-C20547 (the -00P at the end can be ignored)
Caution: 1 digit may make the difference between supported or not supported!

 

 

 

 

 

 

Installation Guide