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Guru3D.com » Review » Radeon HD 5770 in 3-way CrossfireX review » Page 3

Radeon HD 5770 in 3-way CrossfireX review - Installation -- software and power consumption

by Hilbert Hagedoorn on: 10/14/2009 02:00 PM [ ] 0 comment(s)

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Installation and software and power consumption

Before we dive into the benchmark session I wanted to talk you through the process of installing a CrossfireX setup. As explained -- any motherboard with three x16 PCIe slots (preferably x16 per slot) will do. Obviously we are talking about so much horsepower with the new Radeon HD 5000 cards that we do recommend an Intel Core i7 based PC with X58 or P55 motherboard.

You simply seat the two cards and connect the Crossfire fingers like shown below, you can find them at the top-side of the graphics card.

For two cards you use one CrossfireX bridge, for three you use two and for four cards you use three CrossfireX bridges.

Make sure you hook up the power connectors to all graphics cards and connect your monitor to the Radeon HD 5770 card located closest to your CPU. For 3-way CrossfireX you'll need three 6-pin connectors.

This is the hardware part, and yes it is as easy at it sounds.

On the software side of things you simply need to boot into Windows, install the latest Catalyst drivers and after a reboot, in most scenarios, CrossfireX is automatically detected and enabled.

If you are not sure, just start up the Catalyst Control suite, go to the TAB 'CrossfireX' and make sure CrossfireX is flagged.

One last tip, especially with multi-GPU setups, please make sure you have uninstalled old drivers properly prior to installing the new cards and drivers. Typically things never go wrong, but if they do... 99% chance it's related to a residual driver installation.

Power consumption

The Radeon HD 5770 for what it is producing in terms of performance, is a card with a great power specification. Placing two cards in CrossfireX definitely doesn't require you to have a kilowatt PSU.

One of the better accomplishments of the series 5700 graphics cards is the enhancement in its power design, the implementation of voltage and clock regulation is very dynamic. So if we look purely at the Radeon HD 5770 now the maximum wattage consumed would be as follows:

GPU Radeon HD 5770 Radeon HD 5850 Radeon HD 5870
TDP 1 GPU 108W 170W 188W
TDP 2 GPUs 216W 340W 376W
TDP 3 GPUs 324W 510W 564W

Now that's only the graphics card power requirement, you need to add the rest of your PC as well.

Radeon HD 5770
The card requires you to have a 500 Watt power supply unit at minimum if you use it in a high-end system. That power supply needs to have (in total accumulated) at least 40 Amps available on the +12 volt rails.

Radeon HD 5770 CrossfireX (2-way)
A second card requires you to add another 108 Watts. You need a 550 Watt power supply unit if you use it in a high-end system. That power supply needs to have (in total accumulated) at least 55 Amps available on the +12 volt rails. 

Radeon HD 5770 CrossfireX (3-way)
Here's where things get a little tricky, reserve 350 Watts for the GPUs on the +12 volt rails, another 200 Watts for the processor (we assume you are overclocking) and then add another 100W for the regulars.

Really, we say... go with a proper 800W PSU here, as next to a decent safety margin you also need a PSU with enough 6/8-pin power connectors for the graphics cards.

Alright, we've covered most of the hardware. We'll now peek at the cards, the hardware and software suite, and then fire off the benchmarks.

Radeon HD 5770




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