ATI Radeon 4800 Series Detailed
• 956 million transistors on 55nm fabrication process
• PCI Express 2.0 x16 bus interfaces
• 256-bit GDDR3/GDDR5 memory interface
• Microsoft® DirectX® 10.1 support
Shader Model 4.1
32-bit floating point texture filtering
Indexed cube map arrays
Independent blend modes per render target
Pixel coverage sample masking
Read/write multi-sample surfaces with shaders
Gather4 texture fetching
• Unified Superscalar Shader Architecture
o 800 stream processing units
o Dynamic load balancing and resource allocation for vertex, geometry, and pixel shaders
O Common instruction set and texture unit access supported for all types of shaders
o Dedicated branch execution units and texture address processors
o 128-bit floating point precision for all operations
o Command processor for reduced CPU overhead
o Shader instruction and constant caches
o Up to 160 texture fetches per clock cycle
o Up to 128 textures per pixel
o Fully associative multi-level texture cache design
o DXTC and 3Dc+ texture compression
o High resolution texture support (up to 8192 x 8192)
o Fully associative texture Z/stencil cache designs
o Double-sided hierarchical Z/stencil buffer
o Early Z test, Re-Z, Z Range optimization, and Fast Z Clear
o Lossless Z & stencil compression (up to 128:1)
o Lossless color compression (up to 8:1)
o 8 render targets (MRTs) with anti-aliasing support
o Physics processing support
• Dynamic Geometry Acceleration
-High performance vertex cache
-Programmable tessellation unit
-Accelerated geometry shader path for geometry amplification
-Memory read/write cache for improved stream output performance
• Anti-aliasing features
o Multi-sample anti-aliasing (2, 4 or 8 samples per pixel)
o Up to 24x Custom Filter Anti-Aliasing (CFAA) for improved quality
o Adaptive super-sampling and multi-sampling
o Gamma correct
o Super AA (ATI CrossFireX™ configurations only)
o All anti-aliasing features compatible with HDR rendering
• Texture filtering features
-2x/4x/8x/16x high quality adaptive anisotropic filtering modes (up to 128 taps per pixel)
-128-bit floating point HDR texture filtering
-sRGB filtering (gamma/degamma)
-Percentage Closer Filtering (PCF)
-Depth & stencil texture (DST) format support
-Shared exponent HDR (RGBE 9:9:9:5) texture format support
• OpenGL 2.0 support
• ATI Avivo™ HD Video and Display Platform
o 2nd generation Unified Video Decoder (UVD 2)
Enabling hardware decode acceleration of H.264, VC-1 and MPEG-2
Dual stream playback (or Picture-in-picture)
O Hardware MPEG-1, and DivX video decode acceleration
o New enhanced DVD upconversion to HD (new)
o New automatic and dynamic contrast adjustment (new)
o Color space conversion
o Two integrated DVI display outputs
o Primary supports 18-, 24-, and 30-bit digital displays at all resolutions up to 1920×1200 (single-link DVI) or 2560×1600 (dual-link DVI)
o DisplayPort™ output support
o Supports 24- and 30-bit displays at all resolutions up to 2560×16003
o HDMI output support
o Supports all display resolutions up to 1920×1080
o Integrated HD audio controller with up to 2 channel 48 kHz stereo or multi-channel (7.1) o AC3 enabling a plug-and-play cable-less audio solution
o Integrated AMD Xilleon™ HDTV encoder
o Provides high quality analog TV output (component/S-video/composite)
o Supports SDTV and HDTV resolutions
o Underscan and overscan compensation
o MPEG-2, MPEG-4, DivX, WMV9, VC-1, and H.264/AVC encoding and transcoding
o Seamless integration of pixel shaders with video in real time
o VGA mode support on all display outputs
• ATI PowerPlay™
o Advanced power management technology for optimal performance and power savings
o Performance-on-Demand
o Constantly monitors GPU activity, dynamically adjusting clocks and voltage based on user scenario
o Clock and memory speed throttling
o Voltage switching
o Dynamic clock gating
o Central thermal management – on-chip sensor monitors GPU temperature and triggers thermal actions as required
• ATI CrossFireX™ Multi-GPU Technology
o Scale up rendering performance and image quality with two GPUs
o Integrated compositing engine
o High performance dual channel bridge interconnects
|
ATI Radeon™ HD 4870 |
ATI Radeon™ HD 4850 |
ATI Radeon™ HD 3870 |
|||
|
Transistors |
965 million |
965 million |
666 million |
||
|
Manufacturing Process |
55nm |
55nm |
55nm |
||
|
Stream Processors |
800 |
800 |
320 |
||
|
Texture Units |
40 |
40 |
16 |
||
|
Render Back-Ends |
16 |
16 |
16 |
||
|
Core Clock Speed |
750 MHz |
625 MHz |
775 MHz |
||
|
Memory Data Rate |
3.6 Gbps GDDR5 |
2.0 Gbps GDDR3 |
2.25 Gbps GDDR4 |
||
|
Math Processing Rate (Multiply-Add) |
1.2 TeraFLOPS |
1.0 TeraFLOPS |
0.497 TeraFLOPs |
||
|
System Bus Support |
PCI Express 2.0 x16 |
PCI Express 2.0 x16 |
PCI Express 2.0 x16 |
||
|
DirectX Support |
10.1 |
10.1 |
10.1 |
||
|
Tessellation Unit |
Yes |
Yes |
Yes |
||
|
UVD |
Yes |
Yes |
Yes |
||
|
ATI PowerPlay |
Yes |
Yes |
Yes |
||
Finally. The much anticipated 4800 series has been detailed, and anyone can see AMD’s Graphics Group enters with a vengeance and a strong line of features and specs. But what about Anti-Anliasing? So many problems came upon gamers with previous lines of cards from both companies that revealed texture flickering and the like. We will go into depth for Anti-Aliasing. Hit the next page for more.
I think I just gizzed my pants
PCEnthusiast replied on June 24, 2008 9:16 PM:
Hahaha
Officially Awesome = 4800 line
That AA sampling demo is intense. Thanks WiG
Wowwww
venkatezh replied on June 24, 2008 9:08 PM:
Yeah. I was like Eyes bulged. Didn’t expect it. Glad I’m not the only one who sat around for this haha
Going to order this RIGHT now wherever I can.
antaraa replied on June 24, 2008 9:20 PM:
Already ordered mine from TechShopStopUK. Get it soon or they’re ganna be sold out like mad after the review here.
First site to reveal it. Owned
4870 looks so good. Definitely must have. Not a GTX guy after knowing the specs for it. Oh and I’m not dumb
PCEnthusiast replied on June 24, 2008 9:16 PM:
Yeah a real must have no doubt
You’re not the only one. I was up to the edge when it was at 17 secs
IntelLover replied on June 24, 2008 9:12 PM:
for me 5 secs ; )
Awfully nice. Seriously
This is grandeur
AMD Revamp indeed. I think NVIDIA can throw in the white flag now.
I’m just seriously amazed by all the features and specs. And then those AA methods against CSAA. Haha CSAA is history
Very impressed by this
Gizz is right, so happy by all these specs. Glad it didn’t disappointed and wasn’t just hype. Then again, I know WhatIfGaming don’t do hype.
GDDR5 memory + GDDR3 superior clocked on 50? Count me in for both for all of my PC’s
This is really overwhelming. Thanks
TY so much
No one in India ship 4850 or 4870. I want to cry cause specs look nice. ; ( I order international now but shipp fees is hurting! xD
Get over it Vash. It’s really worth it for the 70’s and 50’s. Just do it =)
Wonderful article. Am I late to the parteh ?!
HA! Stayed up late for this. Comment is good to go, and I will definitely be buying the 4850 because of the previous review.
Awesome article as usual. Thx
Oh gosh. Can’t wait for that review from here. It’s going to be epic.
Really nicely detailed article as always. Thank you <3 bf will want to see it ASAP. He actually thought it would end 3 hours later, but it’s pacific.