Meet the Radeon R9 295X2: Build Quality & Performance Expectations

Moving on, let’s talk about the build quality of the card itself. With the 7990 AMD did not explicitly chase the luxury market despite its $1000 price tag, choosing to use a standard mixture of metal and plastic parts as part of their more aggressive pricing and positioning of that card. Even with that choice, the 7990 was a solid card that was no worse for the use of plastic, reflecting the fact that while metal adds a degree of sturdiness to a card, it’s not strictly necessary for a well-designed card.

However with the R9 295X2 priced at $1500 and AMD choosing to go after the luxury market, AMD has stepped up their build quality in order to meet the higher expectations NVIDIA has set with their GTX Titan series of cards. The end result is that while the R9 295X isn’t a carbon copy of the GTX Titan by any means, it does successfully implement the metal finish that we’ve seen with NVIDIA’s luxury cards, and in the process ends up being a very sturdy card that can stand toe-to-toe with Titan.

Overall AMD is using a 2 piece design here. Mounted on top of the PCB is the baseplate, which runs the length of the card. Meanwhile a series of screws around the edge of the metal shroud holds it to the baseplate, making it similar to the shroud AMD used for their reference 290X cards. The bolts seen at the top of the card, despite appearances, are for all practical purposes decorative, with the aforementioned screws being the real key to holding the card together.

Elsewhere, at the top of the card we can see that AMD has taken a page from NVIDIA’s playbook and invested in red LED lighting for the fan on the card and the Radeon logo. This is one of those gimmicks we mentioned earlier, that although don’t improve the functionality of the card at all, have become popular with luxury buyers for showing off their cards.

Wrapping up our discussion of the R9 295X2’s construction, let’s quickly discuss the card’s physical limits and AMD’s own overclocking limits. While we’ll get into the heart of the matter in our look at power/temperature/noise, this is as good a time as any to point out the card’s various limits and why they are what they are.

Starting with the fans, because AMD is relying on a split cooling design with both an on-board fan and a CLLC, AMD doesn’t offer any fan control options for this card. In the case of the CLLC this is because the CLLC itself controls its own fan speed, with the single 120mm fan slaved into the pumps and the pumps in turn adjusting the fan based on their own sensors. Since the 120mm fan is under the control of the pumps and not tied into the board’s fan controller, there’s no way to control this fan short of introducing a physical fan controller in the middle.

The 120mm fan in question is a simple 2pin fan, which is rated to operate between 1200 RPM and 2000 RPM (+/- 10%). Using an optical tachometer we measured the fan operating between 1340RPM at idle and 1860RPM under load, which is a bit high for idle based on AMD’s specifications, but within the 10% window for load operation. The fan does get up to full speed before the GPUs reach their75C temperature limit, so whether it’s FurMark or Crysis, in our experience the 120mm fan maxes out at the same speed and hence the same noise levels.

AMD Radeon R9 295X2 120mm Radiator Fan Speeds
  Spec Measured
Idle 1200 RPM +/- 10% ~1340 RPM
Full Load 2000 RPM +/- 10% ~1860 RPM

Meanwhile the smaller fan on the card itself is rated for 1350 RPM to 2050 RPM, and is tied into the board’s fan controller. However since this fan is responding to board component temperatures rather than GPU temperatures, AMD has not made this fan controllable. AMD’s APIs do not directly expose the temperatures of these components (MSI AB was only able to tell us the GPU temperatures), so it’s not unexpected that this fan can’t be directly controlled.

While fan controls aren’t exposed, AMD does expose the other overclocking controls in their Overdrive control panel. Power limits, temperature limits, CPU clockspeed, and memory clockspeed are all exposed and can be adjusted. However unlike the 290 series, which allowed a GPU temperature of up to 95C, AMD has clamped down on the R9 295X2’s GPUs, only allowing them to reach 75C before throttling. Upon finding this we asked AMD why they were using such a relatively low temperature limit, and the response we received is that it’s due to a combination of factors including the operational requirements of the CLLC itself, and what AMD considers the best temperature for optimal performance. As we briefly discussed in our 290X review leakage increases with temperature, and while Hawaii is supposed to be a lower leakage part leakage is still going to be occurring. To that end our best guess is that 75C is as warm as Hawaii can get before leakage starts becoming a problem for this card.

Which brings us to our final point, which is how close AMD is operating to the limits of the Asetek CLLC. For the nearly 500W that the R9 295X2’s CLLC needs to dissipate, a single 120mm CLLC is relatively small by CLLC standards. CPU CLLCs are easily found in larger sizes, including 140mm, 2x120mm, and 2x140mm (which is what we use for our CPU). In all of those cases CPUs will generate less heat than a pair of GPUs, which means the R9 295X2’s radiator is operating under quite a bit of load.

Based on our testing the CLLC is big enough to handle the load at stock, but only just. Under our most strenuous gaming workloads we’re hitting temperatures in the low 70s coupled all the while the 120mm fan is reaching its maximum fan speed. This level of cooling performance is enough to keep the card from throttling, but it’s clear that the CLLC can’t handle any more heat. Which ties in to what we said earlier about AMD not designing this card for overclocking. Even without voltage adjustments, just significantly increasing the power limit would cause it to throttle based on GPU temperatures. To that end the 120mm CLLC gets the job done, but this is clearly a card that’s best suited for running at stock.

Meet the Radeon R9 295X2: Cooling & Power Delivery Revisiting the Radeon HD 7990 & Frame Pacing
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  • eotheod - Tuesday, April 8, 2014 - link

    Same performance as crossfire 290X? Might be time to do a Mini-ITX build. Half the price of Titan Z also makes it a winner. Reply
  • Torrijos - Tuesday, April 8, 2014 - link

    A lot of compute benchmark see no improvement from a single 290X...
    What is happening?
    Reply
  • Ryan Smith - Tuesday, April 8, 2014 - link

    Most of these compute benchmarks do not scale with multiple GPUs. We include them for completeness, if only to not so subtly point out that not everything scales well. Reply
  • CiccioB - Tuesday, April 8, 2014 - link

    Why not adding more real life computing tests like iRay that runs both for CUDA and OpenCL?
    Syntethic tests are really meaningless as they depends more on the particular istructions used to do... ermm.. nothing?
    Reply
  • fourzeronine - Tuesday, April 8, 2014 - link

    iRay runs on CUDA only. LuxRender should be used for GPU raytrace benchmarking. http://www.luxrender.net/wiki/LuxMark

    Although the best renderers that support OpenCL are hybrid systems that only solve some of the problems on GPU and a card like this would never be fully utilized.

    The best OpenCL bench mark to have would be an agisoft photoscan dense point cloud generation.
    Reply
  • Musaab - Wednesday, April 9, 2014 - link

    I have one question why didn't you use 2 R9 290X with water cool or 2 GTX 780Ti with water cool. I hate this marketing Mumbo Jumbo. if I want to pay this money I will chose two cards from above with water cool and with some OC work they will feed this card the dust and for the same money I can buy 2 R9 290 or 2 GTX 780. Reply
  • Musaab - Wednesday, April 9, 2014 - link

    Sorry I mean three R9290 or three GTX 780 Reply
  • spartaman64 - Sunday, June 1, 2014 - link

    i doubt you can afford 3 of them and water cool them and 3 of them would have a very high tdp also many people would run into space restraints and the r9 295x2 out performs 2 780 ti in sli Reply
  • krutou - Tuesday, April 22, 2014 - link

    Because water blocks and radiators don't grow on trees. Reviewers only test what they're given, all of which are stock. Reply
  • patrickjp93 - Friday, May 2, 2014 - link

    They pretty much do grow on trees. You can get even a moderately good liquid cooling loop for 80 bucks. Reply

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