Sapphire HD 5770 Vapor-X Overclock Edition Reviewccokeman - December 24, 2009
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The HD 5770 series are based on the 40nm "Juniper" core that carries just shy of half the transistor count of the HD 58XX series at 1.04 Billion. Since this is an overclock edition card the base clock speed to the 800 stream processors comes in at 860MHz, 10 MHz higher than the base models. The memory used totals 1GB of GDDR5 running at 1200MHz on a 128bit bus. Additional specs include 40 texture units and 16 ROPs. The first thing you notice is that this card differs substantially in appearance from the reference ATI versions. The heatsink is radically different but the PCB is the same black color. A change for the Vapor-X series. On the back side of the card you can see half of the memory modules.
For connectivity you get what is pretty much standard across the HD 5XXX line up with two Dual Link DVI ports, a single HDMI port that supports HDMI 1.3 and up to 7.1 surround sound through the connection and a single DisplayPort connection so you can take advantage of the Eyefinity capabilities of this card with a resolution up to 7680x1600 when you use a total of 3 -30 inch monitors. Ultimately with this amount of connectivity the bundle is a little short on adapters but really do you need them at this point. Power is supplied to the Sapphire 5770 Vapor-X by means of the 6-pin PCIe connection at the back of the card. You can use this card with up to 3 more for a nice little CrossfireX setup if your motherboard has the ability to support that many cards.
Besides the component selection the feature that sets this card apart from the reference versions is the use of Sapphires Vapor-X cooling. The implementation on this card is pretty much the same one used on the HD 5750 I looked at last month. The cooling solution is comprised of a Plate style Vapor Chamber that contacts the heat source(GPU core) and pulls the heat from core which is in turn sent into the aluminum fin array to be dissipated by the airflow across the fins. You can see where the the chamber has been sealed much like a heatpipe since in reality they operate on the same principles. The cooling assembly looks much like what you would find used on a CPU from the top. The fan blows down over the fins which in turn helps keep the on board components and VRM circuit cool.
The Juniper based 40nm core comes equipped with 800 stream processors, half that of the amount used on the HD 5870 running at 860MHz. Transistor count comes in at 1.04 Billion with 40 texture units and 16 ROPs all around half of what the HD 5870 has. The 1GB of GDDR5 memory is from Hynix and is rated for use at 1250MHz (5000Mhz effective) on a 128 bit bus, this is just over the speed used on the card so it looks like you should have a little overhead for overclocking. Of course your results may vary. This all totals up to compute performance over 1.36 Tflops if you plan on using this card for stream computing.
Lets see how this card performs head to head with its contemporaries.