While many people talk about the two 'big' companies that make heatsinks, you can be forgiven for thinking that no other heatsink manufacturer exists. RDJD might be a new name to some of you guys, however it's been in the business for a while and when looking through their company history you find that they don't only make heatsinks. They construct extruded and folded fin heatsinks, cable and wiring assemblies as well as speakers. With 3 factories in Asia and sales offices in the United States, Ireland, Seoul, Hong Kong and Malaysia you can begin to understand that this company is no 'fly-by-night' firm.
When we got the K702 in for review, we were surprised by a few of it's design features. Heatsinks usually have 'fins' which dissipate the heat, however the K702 has a thin piece of aluminium which is placed vertically and has holes. There are 18 of these plates and they are held into place by built-in fixings. We will see whether this method makes any difference when compared to the tradition 'fins' method.
We were faced with reading the instructions, since the retaining system requires you to use a Number 2 Phillips head screwdriver to tighten the clips onto your Athlon heat transfer plate. You have to be aware that you should not over tighten it, for obvious reasons, a snug fit was, however, achievable and we thought this was a satisfactory fit. It certainly saved us time when compared to taking the two fans off the VOS32+ and then attaching the retaining clips. We thought the retaining system on the K702 was a good move forward and a neat innovation.
The fans supplied were comparable to the ones that are on Globalwin's FKK50. Running at ~6000 RPM (our ones seemed to be running near enough 6300 RPM) they push out 19 CFM. Their dimensions are 52mm x 52mm x 15mm and they are dual-ball bearing. Overall we found these to be generally of good quality and had no problems with them.
Another *very* nice design feature is that the 2 fans do not take up two 3-pin fan headers on your motherboard, but 1. RDJD did a great job of shielding the cables and coiling them, along with making them use only one motherboard connector we were very surprised. This meant we had 1 fan header free on our Biostar, and you people on Abit KA7's will have 2 free. We hope Globalwin and Alpha catch onto this idea, since it'll leave us overclockers with more room for more cooling.
Installation was straightforward once we made sure we were doing the right thing by tightening the retainers using a screw driver. We took this opportunity to check out how the arctic silver does on a new heatsink. There was already some compound on the heatsink, which we scraped off and applied our silicon grease. We also used some Arctic silver, to see what difference there would be. You can see our arctic silver review here.
We used our usual Athlon 550 (revision 2, stepping 1). We thought we'd see how the K702 did in a un-overclocked state, ie. at 550 MHz, and at 700 MHz.
Athlon @ 550 MHz
As we can see the K702 performs very well with both the Silver and Silicon based compounds. As we expected the Silver performed better, but taking that aside, the K702 performed very well. Saying that however, the Athlon was still at it's default clock speed, and we want to know how it would cope when we put it under some real stress.
Athlon 550 @ 700
The K702 holds out well, with there being only a 2 C rise in temperature, and when coupled with the silver compound, it provides a cooling solution that rivals Globalwin's VOS32.
The RDJD K702 is a very nice package, it provides good cooling performance coupled with some very nice usability features. The new style of retaining clip is welcomed as is the use of only 1 fan header for 2 ~6000 RPM fans.
The fin-less design works well, and provides stiff competition to the likes of Globalwin FKK50 and VOS32. We did not have the chance to pit the K702 against an Alpha, but hopefully we will be able to do that soon. Between the FKK50 and the K702, there is very little between them, and if we had the choice we would go for the K702 since it's a gem to work with and it leaves us with 1 more fan header.
If RDJD continue to provide heatsinks of this quality, then it won't be long before their name is alongside Globalwin and Alpha.