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Radeon HD 5770 CrossFireX Performance Scaling E-mail
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Written by Bruce Normann   
Tuesday, 24 November 2009
Table of Contents: Page Index
Radeon HD 5770 CrossFireX Performance Scaling
ATI Radeon HD5770 Features
Radeon HD5770 Specifications
Closer Look: Radeon HD 5770
Radeon HD5770 Detailed Features
ATI Eyefinity Multi-Monitors
Video Card Testing Methodology
CrossFireX and the Radeon HD5770
3DMark Vantage Benchmarks
Crysis Benchmark Results
Devil May Cry 4 Benchmark
Far Cry 2 Benchmarks
Resident Evil 5 Benchmarks
World in Conflict Benchmarks
BattleForge - Renegade Benchmarks
Unigine - Heaven Benchmark Results
Radeon HD5770 CrossFireX Temperature
VGA Power Consumption
Radeon HD5770 CrossFireX Final Thoughts
Radeon HD5770 CrossFireX Conclusion

Radeon HD5770 Detailed Features

The main attraction of ATI's new line of video cards is the brand new GPU with its 40nm transistors and an improved architecture. The chip in the 5700 series is called "Juniper" and is essentially half of the "Cypress", the high-end chip in the HD5800 series that was introduced in September, 2009.

ATI_Radeon_HD5770_Juniper_Headshot.jpg

The Juniper die is very small, as can be seen with this comparison to a well known dimensional standard. ATI still managed to cram over a billion transistors on there, and the small size is critical to the pricing strategy that ATI is pursuing with these new releases.

1 GB of GDDR5 memory, on a 128-bit bus with a 4.8 Gbps memory interface offers a maximum memory bandwidth of up to 76.8 GB/sec. Cutting the Cypress GPU in half limited the bus to 128-bit, but ATI has bumped up the clock rate on all their new boards. With GDDR5 running at 1200 MHz, the memory itself won't be a bottleneck on this card, but the narrower bus width does have a major performance impact. There is some room for memory overclocking via the Overdrive tool distributed by AMD.

ATI_Radeon_HD5770_HYNIX_GDDR5.jpg

The H5GQ1H24AFR-T2C chip from Hynix is rated for 5.0 Gbps, and is one of the higher rated chips in the series, as you can see in the table below. An overclock to the 1250-1300 MHz range is not unthinkable, especially if utilities become available to modify memory voltage.

ATI_Radeon_HD5770_Memory_Table.jpg

The power section provides 3-phase power to the GPU; that's about average for a mid-range graphics card, and while increasing the number of power phases achieves better voltage regulation, improves efficiency, and reduces heat, ATI has used the inherently lower power requirements of the Juniper GPU and some fancy footwork in the power supply control chip to reduce power draw to very low levels.

ATI_Radeon_HD5770_Power_Section.jpg

Where the HD5800 series used a number of Volterra regulators and controllers, the HD5770 makes do with one L6788A controller chip from ST. It's still a relatively sophisticated controller, and the combination of a lower power GPU, low power GDDR5 memory, and smart power supply design yields an incredibly low power consumption of 18W at idle and 108W under duress. These numbers are derived from testing with 3DMark03; ATI says it pulls higher current than more recent versions of the synthetic benchmark. Another cost-cutting measure can be seen here, the use of standard electrolytic capacitors in a few locations.

Before we dive into the testing portion of the review, let's look at one of the most exciting new features available on every Radeon HD5xxx series product, Eyefinity.



 

Comments 

 
# Low Scores on ati 5770 xfireronald jan 2010-11-27 20:43
i cant seem to know the problem with my set up why im getting a low scores on benchmark test with re5 using ati 5770 GPU.

scores with the same set-up: 1920 x 1200 with all settings were max out 8xAA was only 24.1fps with the single card and 42.1 fps with crossfire setup.

Specs:

GPU: Sapphire ATI 5770 Vapor X crossfire config with 1 crossfire cable connected
Proci: thuban 1090t h50 water cooled
mobo: msi 790gx-65g
hdd: samsung 500gb 7200rpm 3.5
mem: ocz obsidian dd3 1600mhz 4GB ( 2by2Gb)
PSU: thermaltake litepower 600w
Monitor: Sony 32in bravia lcd TV
software: dx 11 cat 10.11 win 7

can somebody please help..could it be some components maybe bottleneck?
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# TV is max 1080pBruceBruce 2010-11-27 20:57
I don't know of any Sony Bravia TVs that will display 1920 x 1200. The newest ones will max out at 1920 x 1080. If you have the video card trying to drive this TV with 1920 x 1200, either the TV or the video card is probably freaking out. Try setting the video resolution to 1920 x 1080 if you have one of the newer 1080p TVs. If it's am older unit it's 720P and 1366 x 768 pixels.
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# SameDmennis 2010-12-12 19:40
Ronald ren i have the xfx video cards running in xfire and the same msi motherboard and a 600watt ocz PSU, and i too have the same issue. No matter what game i am running (is playable in crossfire) it seems i get slower performance in crossfire and my single radeon 5770 runs faster. i know with t that mobo it is a 16x lane but when ran in crossfirex it will make the cards 8x X 8x in their respective lanes. Have you ever resolved the issue? I can't figure it out.
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