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Wednesday, 01 April 2009 01:00

Sapphire HD4870 with 2GB of memory defines silence

Written by Sanjin Rados

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Review: Sapphire's silent gem

Our today’s test subject is one exceptionally quiet HD4870 with 2GB of memory coming from Sapphire, and it’s well worth noting that this is the first 2GB HD4870 on the market. It’s not a mystery that a lot of consumers rely on higher numbers alone when purchasing their cards, so we decided to test this card and see whether 2GB brings significant advantage over 1GB cards.

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Radeon HD 4870 comes with GDDR5 memory, which was at the time this card launched, quite expensive and lacking in the availability department. Thankfully, AMD didn’t bow down and still ended up using GDDR5 but combined with a 256-bit memory interface. The first tests on HD 4870 were encouraging, as RV770 coupled with GDDR5 memory packed enough punch to beat its fierce competitor – the Geforce GTX 260. Nvidia of course, wouldn’t settle for second place, so they’ve increased the shader count and did some driver polishing in the meantime, which helped the GTX 260 to gain some ground over its rival.

GDDR5 memory, as you might already know, offers twice the bandwidth as GDDR3 if clocked the same. This means that 512-bit GDDR3 card packs the same bandwidth as the 256-bit GDDR5 card, provided the memory is identically clocked of course.

Compared to the GTX 260 where the 448-bit GDDR3 memory runs at 999MHz and offers a 111.9GB/s bandwidth, the HD 4870 with its 256-bit GDDR5 memory clocked at 900MHz offers a bandwidth of 115.2GB/s. This is due to GDDR5 speeds, and this memory runs at 3600MHz (4x900MHz) on the HD4870 whereas the GTX 260’s memory runs at 1998MHz (2x999MHz).

HD4870 launched with 512MB of memory, whereas the reference model with 1GB of memory followed. This has proven to be a wise move, as the card lost breath at higher resolutions. Additionally, games like Far Cry 2 have utilized additional memory quite well, something we expect to see in most upcoming hot titles. A 1GB video buffer however, is enough for most today’s gaming titles, so performance advantage when using 2GB memory is not as obvious as it is in the 512MB to 1GB jump.

Sapphire Vapor-X HD4870 2GB is the first HD4870 with 2GB of memory, and it boasts extremely quiet yet effective cooling solution. This is thanks to Vapor-X technology, which is Sapphire’s ace for a while now.

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We see that Sapphire changed almost every aspect of the reference model, but the mighty Vapor-X cooling is something that will surely catch your eye first. This dual slot cooling looks quite massive, but taking off the hood reveals that it’s simple and quite small. The aluminum part resembles Intel’s reference CPU cooling, with the addition of Sapphire’s Vapor-X chamber on the bottom. Still, we’d always put silence before looks, and we must admit that on many occasions we wondered whether the fan is spinning at all, that’s how quiet it is.

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We’re no strangers to Vapor-X, as we’ve seen it and tested it on a couple of occasions, the last one being the HD4870 Toxic, here. The cooler ran like a charm with temperatures lower by up to 30°C compared to the reference model, which goes up to 89°C. Apart from the Vapor-X chamber, the aforementioned Toxic card uses three heatpipes. Our today’s card however, uses Vapor-X chamber with no heatpipe technology, but it still does a good job not letting the temperatures exceed 71°C. The fan rpm can be regulated, and thus increase the cooling efficiency with no worrying about high noise levels.

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Vapor-X operates in a way similar to heatpipe technology, using water and vaporization to its advantage. The benefit of this flat design is allowing the vapor chamber to sit directly on the core.

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The heated water then turns to steam, in this case called vapor, and fills the vacuum chamber up. The air pressure within the chamber is extremely low, which enables for quick water-to-vapor transition. Important pieces of this puzzle are also the vaporization, condensation and transportation wicks. The GPU directly touches the vacuum chamber and acts as a heat-source for heating up the vaporization wick. The resulting vapor moves freely towards the cooler part of the chamber, where it turns to water upon touching the cold walls. The condensation wick then gathers the water and the transportation tampon takes it back to the vaporization wick and the process starts over again.

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Sapphire changed the reference PCB and used all solid capacitors as well as “Diamond Black” heatsink chokes, which are more efficient and cooler than standard.

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The back of the card houses a large passive heatsink, located above the power regulators. The PCB is painted blue, which is another proof that Sapphire team had their mitts all over this card. The card requires two 6-pin power cables to run, and you’ll find the connectors at the same spot as on the reference model.

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The memory is evenly distributed across both sides of the card. On the front it’s cooled by the fan, and on the back by the heatsink.

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The memory in question is Qimonda IDGV1G-05A1F1C-40X rated at 1000MHz, but at this card it runs on reference 900MHz (3600MHz effectively).

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Although the cooler does a good job, Sapphire didn’t overclock the card so it still runs at 750MHz. This card is based on the famous RV770, packs almost a billion transistors and it’s built in 55nm. It packs 2.5 times more shaders and texture units compared to the HD 3800 generation and the rest of the important specs can be found on the GPU-Z screenshot.

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All the HD 4xxx cards feature 7.1 audio thanks to the Realtek’s HD Audio processor integrated into the GPU silicone. Unlike Nvidia’s offerings, there’s no need for connecting additional cables in order to bring both video and audio via one HDMi cable. Additionally, Sapphire’s Vapor-X card doesn’t need a DVI-to-HDMI dongle as the card features native HDMI connector. Next to it you’ll find one dual-link DVI and VGA out.

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Sapphire’s packaging looks quite refreshing, and Vapor-X is of course is emphasized. You’ll also find other info such as 2GB of memory, native HDMI support and included software. We must admit that we always found Sapphire’s software offer to be the most complete, and this time you’ll get Cyberlink’s software package, Ruby Rom, 3DMark Vantage and of course – the driver CD.

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Last modified on Wednesday, 01 April 2009 13:55
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