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Gigabyte GV-R477D5-512H-B Radeon HD 4770 Videocard Review

Gigabyte GV-R477D5-512H-B Radeon HD 4770 Videocard Review - PCSTATS
Abstract: ATI's Radeon HD 4770 (code name RV740) is derived from the venerable Radeon RV770 GPU. The Gigabyte GV-R477D5-512H-B videocard has its GPU clocked at 750MHz and is equipped with 512MB GDDR5 memory running at 800MHz, giving it a bandwidth of 51.2 GB/s.
 83% Rating:   
Filed under: Video Cards Published:  Author: 
External Mfg. Website: Gigabyte May 13 2009   Max Page  
Home > Reviews > Video Cards > Gigabyte GV-R477D5-512H-B

Crossfire'd HD4770's - Twice the Value?

Going Crossfire is pretty simple for most users running Windows Vista or XP and using Intel or AMD motherboard chipsets. Pretty much every AMD chipset, including those based on the 780G, 790GX and 790FX chipsets can Crossfire so long as the motherboard has at least two PCI Express x16 videocard slots. Intel's popular P35, P45, X38 and X48 chipsets can also be configured for Crossfire mode, again, as long as there is more than one PCI Express x16 slot available on the motherboard.

Teaming two Radeon HD 4770s together in Crossfire X mode can be done by using the Crossfire bridge connectors on both video cards.

Setting up and enabling Crossfire is as easy as installing the videocards into the PCI Express x16 motherboard slots and connecting them with Crossfire bridge connectors (usually included with the motherboard, check the box). Then all you have to do is install the AMD Catalyst control center, hit the 'enable Crossfire X' option and you should be able to enjoy dual-GPU processing - simple!

The Radeon HD 4770 videocard can be used in Crossfire mode on most Intel and AMD chipsets that have dual x16 PCI Express slots.

Built for Mainstream Gaming - Radeon HD 4770 Technology

Most significantly, the Radeon HD 4770 'RV740' GPU is manufactured on the 40nm process, making it the first GPU from NVIDIA or ATI to be made with this process technology. The GPU itself contains 826 million transistors, and total board power sits around 80W. Smaller manufacturing processes improve power efficiency and to some extent allows the GPU to be clocked higher without the lock-step increase in heat. Another benefit is that videocard manufacturers can produce more GPUs from the same silicon wafer, which lowers production costs and keeps the videocard affordable.

To really understand where the new ATI Radeon HD 4770 (RV740) graphics card fit in, it's best to compare it directly against several existing mainstream videocards. For although the new RV740 GPU is a direct descendent of the RV770 from AMD's flagship Radeon HD 4870 and 4870 X2 graphics cards, much of the original card's complex microarchitecture has been stripped down.

While the model numbers indicate that the Radeon HD 4770 is a series "below" the Radeon HD 4850, the RV740 GPU is clocked at 750MHz, compared to 625MHz for the Radeon HD 4850. The new Radeon HD 4770 is paired with GDDR5 memory operating at 800MHz (effective speed: 3200MHz), so it has a higher data rate than the GDDR3 RAM used with Radeon HD 4850 cards.

Videocard Comparison Chart

AMD Radeon HD 4550 AMD Radeon HD 4770 AMD Radeon HD 4830 AMD Radeon HD 4850 NVIDIA Geforce GTS 250
GPU Code Name: RV710 RV740 RV770 RV770 G92+
GPU Process: 55nm 40nm 55nm 55nm 55nm
GPU Transistors: 242 Million 826 Million 956 Million 956 Million 754 Million
Board Power: 25W 80W 110W 110W 150W
GPU Core Clock Speed: 600MHz 750MHz 575MHz 625MHz 738MHz
Memory Speed: 800MHz(1600MHz GDDR3) 800MHz(3200MHz GDDR5) 900MHz(1800MHz DDR) 993MHz(1986MHz DDR) 1100MHz(2200 DDR)
Memory Capacity: 256MB 512MB GDDR5 512MB GDDR3 512MB GDDR3
Memory bandwidth: 12.8 GB/S 51.2 GB/S 57.6 GB/S

63.5 GB/S

70.4 GB/S
Stream Processors: 80 640 640 800 128
Texture units: 8 32 32 40 64
Raster Operators: 4 16 16 16 16
GFLOPS: 96 960 736 1000 470

However the Radeon 4850 GPU still has more robust architecture; 800 stream processors and a 40 texture units compared to the HD 4770 which has 640 stream processors and 32 texture units. Even the Radeon HD 4770's use of GDDR5 memory doesn't make it a clear winner on specs alone, since it's limited to a 128-bit wide memory bus, whereas the Radeon HD 4850 GDDR3 memory uses a 256-bit wide memory bus.

What all this means is that the RV740 GPU isn't quite as smart as the RV770 or NVIDIA's G92+, but it's not too far off.

The HD 4850 has more stream processors than the HD 4770 (800 vs 640), while the GTS250 makes use of more texture units and vertex pipelines, which turns into greater shader processing and geometry rendering power.

This means that games that feature complex special effects like distortion, HDR lighting or reflections, or in games with especially complex geometry, the Radeon HD 4770 won't get quite as much done each rendering pass, although it does boast compute performance of 960GFLOPs.

Altogether the new Radeon HD 4770 being unleashed today will likely process less shader information in a single pass than the Radeon HD 4850, but compensate for that by running through each pass more quickly. This should translate to very close benchmark results between the two cards in shader-intensive games like Crysis, but there's no need to speculate.

There are a pair of Radeon HD 4770 videocards sitting on the PCSTATS test bench right now, let's see how they fare against high-end videocards in the power draw test next!

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Contents of Article: Gigabyte GV-R477D5-512H-B
 Pg 1.  Gigabyte GV-R477D5-512H-B Radeon HD 4770 Videocard Review
 Pg 2.  — Crossfire'd HD4770's - Twice the Value?
 Pg 3.  Overclocking, Power Draw, Test System Specs
 Pg 4.  Videocard Benchmarks: 3DMark06
 Pg 5.  DX10 Videocard Benchmarks: 3DMark Vantage, Crysis
 Pg 6.  DX10 Videocard Benchmarks: Call of Juarez
 Pg 7.  DX10 Videocard Benchmarks: Lost Planet
 Pg 8.  Videocard Benchmarks: FEAR
 Pg 9.  AA/AF Videocard Benchmarks: FEAR
 Pg 10.  AA/AF Videocard Benchmarks: Crysis
 Pg 11.  Conclusion - Mainstream to the Power of Two

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