Sapphire HD 4770 PCIe Graphics Card

Introduction

Introduction
 
Codenamed RV740, the HD4770 is ATI's latest GPU that's manufactured using TSMC's 40 nanometer fabrication process. While most other chips adopt the 55nm process, AMD have seen fit to test the water with their new chip in the highly competitive budget/performance sector of the graphics card market. A smaller fabrication had benefits that enable the chip to be produced at a smaller cost with the added benefit of consuming less power. Because less power is used, less heat is produced which allows the chip to be clocked higher than before. While I won't go to far into the intricacies of the actual differences between the RV770 and the new RV740, I will say that the chip, at first glance anyway appears to be a slightly scaled down version of the RV770 (used in the 4800 range). There are however a few subtle differences.
 
The HD4770 has had it's memory interface cut in half from 4x64bit (256bit) to 2x64bit (128bit). This lower interface has however been countered with the use of GDDR5 running at a blistering 800MHz which transfers data at twice the rate as GDDR3. Ultimately the memory bandwidth is therefore not affected too much by the reduction in interfaces. The stock GPU clockspeed is also slightly higher than the HD4850, running at 750MHz which might go some way for making up the lost ground in memory bandwidth and shaders compared to the 4850. To muddy the waters further, the HD4830 has higher memory bandwidth (As it too uses the 256bit interface) but has lower texel filtering and pixel fill rates. Sadly we don't have a HD4830 to include in today's review but on paper, the 4770 has it beat in all categories but memory bandwidth.
 
The Sapphire version of the 4770 is based on the reference design with stock clocks and stock heat sink. Being a tier one partner of ATI, you can be assured of the quality of produce from Sapphire. Here's what they have to say about their card:
 
The new SAPPHIRE HD 4770 is the first card in its class to use GDDR5 memory and is based on the first ever GPU built in 40nm process technology. It uses the powerful graphics architectures from the ATI division of AMD, incorporating multi-purpose stream processing units and improved memory management architecture.

GDDR5 memory
DirectX® 10.1
24x custom filter anti-aliasing (CFAA) and high performance anisotropic filtering
Dual mode ATI CrossFireX™ multi-GPU support for highly scalable performance
PCI Express® 2.0 support
Dynamic geometry acceleration
Game physics processing capability
ATI Avivo™HD video and display technology
Dynamic power management with ATI PowerPlay™ technology
ATI Stream technology
 
 
Specification
 
The following specification was taken directly from the Sapphire product page:
 
I/O Output: Dual DL-DVI-I+HDTV
Core Clock: 750 MHz
PCI Express 2.0 x16 bus interface
Memory Clock: 800 MHz, 3.2Gbps
512MB /128bit GDDR5 memory interface
Dual Slot Active Cooler
HDMI compliant via dongle
7.1 Audio Channel Support
Microsoft® DirectX® 10.1 support
Shader Model 4.1 support
 
So then, a stock clocked reference card. Note that the shrink in die has allowed ATI to implement 750MHz on the core which should bump up performance considerably. Also included is the latest incarnation of graphics card memory in the form of Qimonda GDDR5.
 
Let's take a look at the packaging and the GPU itself... 
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Most Recent Comments

22-05-2009, 02:10:34

JN
"Entry level gaming GPU's are often overlooked with the constant battle waged at the high end of the market. Today we take a look at Sapphires interpretation of the new HD4770 GPU..." - by W3bbo

http://www.overclock3d.net/gfx/artic...105500384s.jpg

Read on...

22-05-2009, 02:48:37

f0x.
Good review mate, have to agree about the single slot cooler, would have been a great card for a media center if you wanted to do a bit of gaming as well

22-05-2009, 03:57:09

tinytomlogan
Im actualy putting 2 of these in a new rig for a customer, little stormers of GPU's!

We finaly get a new 8800gt

22-05-2009, 03:58:37

Mul.
Awesome little graphics card. Nice to see one with a single slot cooler too

22-05-2009, 07:09:38

w3bbo
This doesn't have a single slot cooler - just one of my critcisms. Great card all the same though and I agree about the 8800GT comment.

22-05-2009, 07:37:33

Rastalovich
Pretty much a carbon copy of the ASUS variant in terms of performance.

How much in terms of quality settings, can these cards achieve these days ? in comparison to perhaps a 8800gt ?

22-05-2009, 07:56:06

Mul.
Quote:
Originally Posted by name='Mul.'
Awesome little graphics card. Nice to see one with a single slot cooler too
My apologies. Misread one of the above posts and had only really looked at the performance figures. Just read the review fully now.

22-05-2009, 07:56:57

w3bbo
Quality is not too bad, resolutions seemed to have a bigger effect (2560x1600 is pain full to watch at times). For your average gamer though they are not half bad at all.

22-05-2009, 08:18:54

Rastalovich
Quote:
Originally Posted by name='w3bbo'
Quality is not too bad, resolutions seemed to have a bigger effect (2560x1600 is pain full to watch at times). For your average gamer though they are not half bad at all.
Sorry m8, I meant like how far the typical new amd card can throw up AA settings and the other Q within games.

(in comparison to the 8800gt if u like)

22-05-2009, 10:42:42

w3bbo
Well I don't have an 8800GT to hand m8 so I can't really compare directly I'm afraid. I may just have a 1GHz version coming soon though, so if you want me to try your preference of res/AA setting gimme a shout.

22-05-2009, 11:31:19

Rastalovich
Nah w3bb0 m8, simpler, if u go into a game, what is selectable from the graphic options thing in terms of quality settings.

We know that if u go into "a" game with something like a 8800GT, for example, u can go 16xAA and 8x on filtering (or whatever), and that weird glow thing (that works well in TW I might add).

Despite what the "performance" may be, what u get on the amd's these days ?

22-05-2009, 11:41:53

w3bbo
If memory serves it can go up to 24xCu AA (custom AA) or 8x Standard MSAA with upto 8x AF.

22-05-2009, 11:45:19

Rastalovich
That's pretty good. I guess that custom AA is like the QQ.

(I have no idea tbh)

Good to see some quality breaking in there instead of just raw fps.
Reply
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