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Guru3D.com » Review » Radeon HD 5770 review » Page 3

Radeon HD 5770 review - Radeon HD Series 5000 features

by Hilbert Hagedoorn on: 10/12/2009 02:00 PM [ 4] 0 comment(s)

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Radeon HD Series 5700 features

So we have just established product positioning and have seen what cards to expect. Today is all about the Radeon HD 5770. Let's have a peek at some of the key features for this product:

  • 1GB GDDR5 memory (128-bit)
  • ATI Eyefinity technology with support for up to six displays
  • ATI Stream technology
  • Designed for DirectCompute 5.0 and OpenCL
  • Accelerated Video Transcoding (AVT)
  • Compliant with DirectX 11 and earlier revisions
  • Supports OpenGL 3.1
  • ATI CrossFireX™ multi-GPU support for highly scalable performance
  • ATI Avivo™ HD video and display technology
  • Dynamic power management with ATI PowerPlay technology
  • DL-DVI, DL-DVI, DisplayPort, HDMI
  • PCI Express® 2.0 support

We'll address the majority of features in our article. But first let's focus on the sheer technical specifications. Transistor count for example. The number of transistors always works as an indicator of how powerful a product will be.

Today's tested product will position itself smack down inbetween the Radeon HD 4850 and the Radeon 4870 in terms of performance. The Radeon HD 4870 which we all know and love for its performance had 956 million transistors embedded onto that die. The new Radeon HD 5700 GPUs have 1040 million transistors. Correct, that is 1+ billion transistors tucked away in a small chip. The fabrication node just like the 5800 series is 40nm for this product.

The Radeon HD 5770 will be clocked at a cool 850 MHz (we even took it towards 950 MHz without any issues). It's memory is clocked at 1200 MHz (4800 MHz effective).

The slower performing Radeon 5750 will be clocked at 700 MHz on the Core and Shader domain and 1150 MHz on the memory (4600 MHz on the memory).

Shader processors then, similar to the Radeon HD 4850/4870/4890 the Radeon HD 5770 will have 800 Shader processors, with the 5750 having 720 Shader processors. Though that looks a little pale in comparison to the 5800 series, remember .. these are mid-range products at really affordable prices (!).

The number of ROP units are rocking steady at 16 and sure --  texture units remain at 40 for the 5770 and 36 for the 5750.

But before you get blinded by all the specs in a few lines of text, let's break down the two cards announced today in comparison to last year's Radeon HD 4870.

  Radeon HD 4870 Radeon HD 5750 Radeon HD 5770 Radeon HD 5870
Process 55nm 40nm 40nm 40nm
Transistors 956M 1.04B 1.04B 2.15B
Die Size 263 mm² TBA TBA 334 mm²
Core Clock 750 MHz 700 MHz 850 MHz 850 MHz
Shader Processors 800 720 800 1600
Compute Performance 1.2 TFLOPs 1.008 TFLOPs 1.36 TFLOPs 2.72 TFLOPs
Texture Units 40 36 40 80
Texture Fillrate 30.0 GTexels/s 25.2 GTexels/s 34 GTexels/s 68.0 GTexels/s
ROPs 16 16 16 32
Pixel Fillrate 12.0 GPixels/s 11.2 GPixels/s 13.6 GPixels/s 27.2 GPixels/s
Z/Stencil 48.0 GSamples/s 44.8 GSamples/s 54.4 GSamples/s 108.8 GSamples/s
Memory Type GDDR5 GDDR5 GDDR5 GDDR5
Memory Clock 900 MHz 1150 MHz 1200 1200 MHz
Memory Data Rate 3.6 Gbps 4.6 Gbps 4.8 Gbps 4.8 Gbps
Memory Bandwidth 115.2 GB/s 73.6 GB/s 76.8 GB/s 153.6GB/s
Maximum Board Power (TDP) 160W 86W 108W 188W
Idle Board Power 90W 16W 18 27W

These numbers are really good, for the money this is going to make an excellent mid-range product series. We have not discussed it just yet, but memory; ATI will stick to DDR5 for both products. On the 5700 they'll crank it down a notch though we have 128-bit memory, cutting the bandwidth in half. However, since it's gDDR5 memory it will still offer sufficient enough bandwidth.

But yes, the culprit of the 5700 series will be a cut off memory bandwidth, and this is the reason why it's performance will be slightly lower (on average) than say a Radeon HD 4870.

However, you can expect the Radeon HD 5770 to outperform any current single-GPU based graphics card in the mid-range segment like the Radeon HD 4850 and GeForce GTS 250. And all that with a single chip utilizing less than 108 Watts.

Power Consumption

One of the biggest accomplishments of the series 5000 graphics cards is the enhancement in the power design, the implementation of voltage and clock regulation is even more dynamic -- power management at a new level.

So we'll look purely at the Radeon HD 5770 now, in IDLE the GPU will clock down and lower its voltages on both GPU and memory. Have a look:

GPU Radeon HD 4870 Radeon HD 5750 Radeon HD 5770
Max. Board Power (TDP) 160W 86W 108W
Idle Board Power 90W 16W 18W

The card achieves a low 18W IDLE power consumption by clocking down in several power stages. Thus a low engine (core) clock frequency with lowered voltages and lower GDDR5 memory power. It's amazing though as your generic graphics card would normally consume 50~60 Watts when it idles in Windows.

Things get even better though, the performance of the graphics card opposed to the last generation products remains roughly the same yet the 5770 has a TDP (peak wattage) of only 108 Watts. That is frickin amazing.

We will test power consumption later on in this article.

Radeon HD 5770




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