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Differences What are the advantages of each

Front view of Radeon HD 4670

Reasons to consider the
ATi Radeon HD 4670

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Higher clock speed 750 MHz vs 700 MHz More than 5% higher clock speed
Higher texture rate 24 GTexel/s vs 5.6 GTexel/s More than 4.2x higher texture rate
More texture mapping units 32 vs 8 24 more texture mapping units
Front view of Radeon HD 2600 XT Mac

Reasons to consider the
ATi Radeon HD 2600 XT Mac

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Slightly lower TDP 45W vs 59W Around 25% lower TDP

Features Key features of the Radeon HD 4670  vs 2600 XT Mac 

memory bandwidth Rate at which data can be read from or stored in onboard memory

PVRGC is an in-flight (intermediate) geometry compression technology, intended to reduce the amount of bandwidth needed to shuffle geometry within the GPU and between the GPU and its external RAM, with an average compression ratio of 3:2.
Radeon HD 2600 XT Mac | by Ryan-Smith (Jan, 2014)

pixel rate Number of pixels a graphics card can render to the screen every second

Radeon HD 4670
6 GPixel/s
Radeon HD 2600 XT Mac
2.8 GPixel/s
“The entry-level 21.5-inch iMac features a 2.7 GHz quad-core Intel Core i5 processor and new Iris Pro graphics for unprecedented levels of integrated graphics performance.
Radeon HD 2600 XT Mac | by Syed-Muhammad-Usman-Pirzada (Sep, 2013)

texture rate Speed at which a graphics card can perform texture mapping

Radeon HD 4670
24 GTexel/s
Radeon HD 2600 XT Mac
5.6 GTexel/s
Another noteworthy improvement is the Fusion Drive performance increase.
Radeon HD 2600 XT Mac | by Syed-Muhammad-Usman-Pirzada (Sep, 2013)

floating point performance How fast the gpu can crunch numbers

Radeon HD 4670
480 GFLOPS
Intel’s Haswell architecture also brings the latest AVX 2.0 (Advanced Vector Instructions 2.0) which doubles the theoretical FLOPS per clock on each core.
Radeon HD 2600 XT Mac | by hassan-mujtaba (Sep, 2014)

shading units Subcomponents of the gpu, these run in parallel to enable fast pixel shading

Our sources report that AMD is indeed planning to introduce an XT version of the Tonga GPU which will not only have a higher Stream Processor count, most likely 2048, but also come with a wider 384-bit memory interface.
Radeon HD 2600 XT Mac | by Slobodan-Simic (Aug, 2014)

texture mapping units Built into each gpu, these resize and rotate bitmaps for texturing scenes

This means that we will be looking at a graphics card which will pack a total of 5632 Stream Processors, 352 TMUs and 128 ROPs, since the single Hawaii XT GPU feature 2816 Stream processors, 176 TMUs and 64 ROPs.
Radeon HD 2600 XT Mac | by Slobodan-Simic (Mar, 2014)

Specifications Full list of technical specs

gpu

Radeon HD 4670  vs
2600 XT Mac 
GPU brand ATi ATi
GPU name RV730 RV630
Market Desktop Desktop
Clock speed 750 MHz 700 MHz
Is dual GPU No No
Reference card None None

raw performance

Shading units 320 120
Texture mapping units 32 8
Render output processors 8 4
Compute units 4 3
Pixel rate 6 GPixel/s 2.8 GPixel/s
Texture rate 24 GTexel/s 5.6 GTexel/s
Floating-point performance 480 GFLOPS 168 GFLOPS

memory

Radeon HD 4670  vs
2600 XT Mac 
Memory clock speed 800 MHz 800 MHz
Effective memory clock speed 1,600 MHz 1,600 MHz
Memory bus 128 bit 128 bit
Memory 512 MB 256 MB
Memory type GDDR3 GDDR3
Memory bandwidth 25.6 GB/s 25.6 GB/s

noise and power

TDP 59W 45W

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