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Gaming Performance Comparison

Recommended System Requirements
Game Radeon HD 2900 GT Radeon HD 3850 AGP
Red Dead Redemption 2 1330% 937%
Halo: Reach 355% 229%
Cyberpunk 2077 1865% 1324%
Call of Duty: Modern Warfare 1330% 937%
Doom Eternal 1130% 791%
Microsoft Flight Simulator 1865% 1324%
Grand Theft Auto VI 2086% 1484%
Dragon Ball Z Kakarot 782% 540%
Star Wars: Jedi - Fallen Order 1865% 1324%
Need For Speed Heat 1330% 937%

In terms of overall gaming performance, the graphical capabilities of the AMD Radeon HD 3850 AGP are significantly better than the AMD Radeon HD 2900 GT.

The HD 3850 has a 68 MHz higher core clock speed and 4 more Texture Mapping Units than the HD 2900. This results in the HD 3850 providing 3.5 GTexel/s better texturing performance. This still holds weight but shader performance is generally more relevant, particularly since both of these GPUs support at least DirectX 10.

The HD 3850 has a 68 MHz higher core clock speed and 4 more Render Output Units than the HD 2900. This results in the HD 3850 providing 3.5 GPixel/s better pixeling performance. However, both GPUs support DirectX 9 or above, and pixeling performance is only really relevant when comparing older cards.

The HD 3850 was released less than a year after the HD 2900, and so they are likely to have similar driver support for optimizing performance when running the latest games.

The HD 3850 has 256 MB more video memory than the HD 2900, so is likely to be slightly better at displaying game textures at higher resolutions. This is supported by the fact that the HD 3850 also has superior memory performance overall.

The HD 3850 has 1.9 GB/sec greater memory bandwidth than the HD 2900, which means that the memory performance of the HD 3850 is marginally better than the HD 2900.

The Radeon HD 2900 GT has 240 Shader Processing Units and the Radeon HD 3850 AGP has 320. However, the actual shader performance of the HD 2900 is 94 and the actual shader performance of the HD 3850 is 214. The HD 3850 having 120 better shader performance and an altogether better performance when taking into account other relevant data means that the HD 3850 delivers a marginally smoother and more efficient experience when processing graphical data than the HD 2900.

The HD 3850 transistor size technology is 25 nm (nanometers) smaller than the HD 2900. This means that the HD 3850 is expected to run slightly cooler and achieve higher clock frequencies than the HD 2900.

The Radeon HD 2900 GT requires 150 Watts to run and the Radeon HD 3850 AGP requires 75 Watts. We would recommend a PSU with at least 550 Watts for the HD 2900 and a PSU with at least 450 Watts for the HD 3850. The HD 2900 requires 75 Watts more than the HD 3850 to run. The difference is significant enough that the HD 2900 may have an adverse affect on your yearly electricity bills in comparison to the HD 3850.

Game FPS Benchmarks On Ultra

GPU Architecture

Core Speed600 MHzvs668 MHz
Boost Clock-vs-
ArchitectureR600 GTRV670 PRO
OC Potential Good vs Poor
Driver Support - vs -
Release Date06 Nov 2007vs03 Jan 2008
GPU LinkGD LinkGD Link

GPU Memory

Memory256 MBvs512 MB
Memory Speed800 MHzvs830 MHz
Memory Bus256 Bitvs256 Bit
Memory TypeGDDR3vsGDDR3
Memory Bandwidth51.2GB/secvs53.1GB/sec
L2 Cache - vs -
Delta Color Compression no vs no
Memory Performance 0% green tick vs green tick 0%

GPU Display

Shader Processing Units240vs320
Actual Shader Performance5%vs10%
Texture Mapping Units12vs16
Texture Rate7.2 GTexel/svs10.7 GTexel/s
Render Output Units12vs16
Pixel Rate7.2 GPixel/svs10.7 GPixel/s

GPU Outputs

Max Digital Resolution (WxH)2560x1600vs2560x1600
VGA Connections0vs0
DVI Connections2vs2
HDMI Connections0vs0
DisplayPort Connections-vs-

GPU Power Requirements

Max Power150 Wattsvs75 Watts
Recommended PSU550 Watts & 30 Ampsvs450 Watts & 28 Amps

GPU Features

Shader Model4.0vs4.1
Open GL3.1vs3.3
Open CL-vs-
Notebook GPUnono

GPU Supporting Hardware

Recommended ProcessorIntel Core 2 Duo E6400 2.13GHzvsIntel Core 2 Duo E6850 3.0GHz
Recommended RAM3 GBvs4 GB
Maximum Recommended Gaming Resolution1024x768vs1366x768

Gaming Performance Value

Performance Value

GPU Mini Review

Mini ReviewRadeon HD 2900 GT is a high-end GPU based on the 80nm variant of the second unified shader architecture, R600.
It's based on the R600 GT Core and offers 240 Shader Processing Units, 12 TMUs and 12 ROPs a 256-bit memory interface of standard GDDR3. The central unit runs at 600MHz and the memory clock runs at up to 800MHz.
Its performance is not comparable to neither Radeon HD 2900 Pro nor Radeon HD 2900 XT due to featuring only 240 Shader Processing Units. Still, it's clearly above Radeon HD 2600 GPUs.
Due to the limited memory size, most of today's games will require unattractive resolutions but should run fluently from medium to high settings at anything below 1024x768.
Radeon HD 3850 AGP is a variant of the high-end Radeon HD 3850 based on the 55nm, second unified shader architecture, R600. Check its page to know more about its Core.
Compared to Radeon HD 3850, it features twice as much video memory and an AGP 8X Bus Interface. Benchmarks indicate the double sized frame buffer benefits this GPU largely and so its performance is up to 8% better than the reference Radeon HD 3850.
Today's modern games should run fluently at medium settings but with modest resolutions. DirectX 11 games aren't supported.
Recommended CPU
Possible GPU Upgrades
GPU Variants