Radeon RX 7900 GRE vs Iris Plus Graphics 645
Aggregate performance score
We've compared Iris Plus Graphics 645 and Radeon RX 7900 GRE, covering specs and all relevant benchmarks.
RX 7900 GRE outperforms Iris Plus Graphics 645 by a whopping 1459% based on our aggregate benchmark results.
Primary details
GPU architecture, market segment, value for money and other general parameters compared.
| Place in the ranking | 658 | 24 |
| Place by popularity | not in top-100 | not in top-100 |
| Power efficiency | 20.50 | 18.44 |
| Architecture | Generation 9.5 (2016−2020) | RDNA 3.0 (2022−2024) |
| GPU code name | Coffee Lake GT3e | Navi 31 |
| Market segment | Desktop | Desktop |
| Release date | 7 October 2019 (5 years ago) | 27 July 2023 (1 year ago) |
Detailed specifications
General parameters such as number of shaders, GPU core base clock and boost clock speeds, manufacturing process, texturing and calculation speed. Note that power consumption of some graphics cards can well exceed their nominal TDP, especially when overclocked.
| Pipelines / CUDA cores | 384 | 5120 |
| Core clock speed | 300 MHz | 1287 MHz |
| Boost clock speed | 1050 MHz | 2245 MHz |
| Number of transistors | no data | 57,700 million |
| Manufacturing process technology | 14 nm+++ | 5 nm |
| Power consumption (TDP) | 15 Watt | 260 Watt |
| Texture fill rate | 50.40 | 718.4 |
| Floating-point processing power | 0.8064 TFLOPS | 45.98 TFLOPS |
| ROPs | 6 | 160 |
| TMUs | 48 | 320 |
| Ray Tracing Cores | no data | 80 |
Form factor & compatibility
Information on compatibility with other computer components. Useful when choosing a future computer configuration or upgrading an existing one. For desktop graphics cards it's interface and bus (motherboard compatibility), additional power connectors (power supply compatibility).
| Interface | Ring Bus | PCIe 4.0 x16 |
| Length | no data | 276 mm |
| Width | IGP | 2-slot |
| Supplementary power connectors | no data | 2x 8-pin |
VRAM capacity and type
Parameters of VRAM installed: its type, size, bus, clock and resulting bandwidth. Integrated GPUs have no dedicated video RAM and use a shared part of system RAM.
| Memory type | System Shared | GDDR6 |
| Maximum RAM amount | System Shared | 16 GB |
| Memory bus width | System Shared | 256 Bit |
| Memory clock speed | System Shared | 2250 MHz |
| Memory bandwidth | no data | 576.0 GB/s |
| Shared memory | + | - |
Connectivity and outputs
Types and number of video connectors present on the reviewed GPUs. As a rule, data in this section is precise only for desktop reference ones (so-called Founders Edition for NVIDIA chips). OEM manufacturers may change the number and type of output ports, while for notebook cards availability of certain video outputs ports depends on the laptop model rather than on the card itself.
| Display Connectors | Portable Device Dependent | 1x HDMI 2.1a, 2x DisplayPort 2.1, 1x USB Type-C |
| HDMI | - | + |
Supported technologies
Supported technological solutions. This information will prove useful if you need some particular technology for your purposes.
| Quick Sync | + | no data |
API compatibility
List of supported 3D and general-purpose computing APIs, including their specific versions.
| DirectX | 12 (12_1) | 12 Ultimate (12_2) |
| Shader Model | 6.4 | 6.7 |
| OpenGL | 4.6 | 4.6 |
| OpenCL | 3.0 | 2.2 |
| Vulkan | 1.3 | 1.3 |
Synthetic benchmark performance
Non-gaming benchmark results comparison. The combined score is measured on a 0-100 point scale.
Combined synthetic benchmark score
This is our combined benchmark score. We are regularly improving our combining algorithms, but if you find some perceived inconsistencies, feel free to speak up in comments section, we usually fix problems quickly.
Passmark
This is the most ubiquitous GPU benchmark. It gives the graphics card a thorough evaluation under various types of load, providing four separate benchmarks for Direct3D versions 9, 10, 11 and 12 (the last being done in 4K resolution if possible), and few more tests engaging DirectCompute capabilities.
3DMark 11 Performance GPU
3DMark 11 is an obsolete DirectX 11 benchmark by Futuremark. It used four tests based on two scenes, one being few submarines exploring the submerged wreck of a sunken ship, the other is an abandoned temple deep in the jungle. All the tests are heavy with volumetric lighting and tessellation, and despite being done in 1280x720 resolution, are relatively taxing. Discontinued in January 2020, 3DMark 11 is now superseded by Time Spy.
3DMark Fire Strike Graphics
Fire Strike is a DirectX 11 benchmark for gaming PCs. It features two separate tests displaying a fight between a humanoid and a fiery creature made of lava. Using 1920x1080 resolution, Fire Strike shows off some realistic graphics and is quite taxing on hardware.
Gaming performance
Let's see how good the compared graphics cards are for gaming. Particular gaming benchmark results are measured in FPS.
Average FPS across all PC games
Here are the average frames per second in a large set of popular games across different resolutions:
| Full HD | 26
−708%
| 210
+708%
|
| 1440p | 8−9
−1563%
| 133
+1563%
|
| 4K | 5−6
−1480%
| 79
+1480%
|
FPS performance in popular games
Full HD
Low Preset
| Cyberpunk 2077 | 7−8
−2871%
|
208
+2871%
|
Full HD
Medium Preset
| Assassin's Creed Odyssey | 10−12
−1191%
|
140−150
+1191%
|
| Assassin's Creed Valhalla | 3−4
−4000%
|
120−130
+4000%
|
| Battlefield 5 | 9−10
−2344%
|
220−230
+2344%
|
| Call of Duty: Modern Warfare | 9−10
−1222%
|
110−120
+1222%
|
| Cyberpunk 2077 | 7−8
−2529%
|
184
+2529%
|
| Far Cry 5 | 8−9
−1363%
|
110−120
+1363%
|
| Far Cry New Dawn | 10−12
−1427%
|
160−170
+1427%
|
| Forza Horizon 4 | 24−27
−888%
|
230−240
+888%
|
| Hitman 3 | 9−10
−1333%
|
120−130
+1333%
|
| Horizon Zero Dawn | 27−30
−830%
|
250−260
+830%
|
| Metro Exodus | 8−9
−1838%
|
150−160
+1838%
|
| Red Dead Redemption 2 | 10−11
−1110%
|
120−130
+1110%
|
| Shadow of the Tomb Raider | 14−16
−1827%
|
280−290
+1827%
|
| Watch Dogs: Legion | 40−45
−253%
|
150−160
+253%
|
Full HD
High Preset
| Assassin's Creed Odyssey | 10−12
−1191%
|
140−150
+1191%
|
| Assassin's Creed Valhalla | 3−4
−4000%
|
120−130
+4000%
|
| Battlefield 5 | 9−10
−2344%
|
220−230
+2344%
|
| Call of Duty: Modern Warfare | 9−10
−1222%
|
110−120
+1222%
|
| Cyberpunk 2077 | 7−8
−2157%
|
158
+2157%
|
| Far Cry 5 | 8−9
−1363%
|
110−120
+1363%
|
| Far Cry New Dawn | 10−12
−1427%
|
160−170
+1427%
|
| Forza Horizon 4 | 24−27
−888%
|
230−240
+888%
|
| Hitman 3 | 9−10
−1333%
|
120−130
+1333%
|
| Horizon Zero Dawn | 27−30
−830%
|
250−260
+830%
|
| Metro Exodus | 8−9
−1838%
|
150−160
+1838%
|
| Red Dead Redemption 2 | 10−11
−1110%
|
120−130
+1110%
|
| Shadow of the Tomb Raider | 14−16
−2587%
|
403
+2587%
|
| The Witcher 3: Wild Hunt | 16−18
−819%
|
140−150
+819%
|
| Watch Dogs: Legion | 40−45
−253%
|
150−160
+253%
|
Full HD
Ultra Preset
| Assassin's Creed Odyssey | 10−12
−1191%
|
140−150
+1191%
|
| Assassin's Creed Valhalla | 3−4
−4000%
|
120−130
+4000%
|
| Call of Duty: Modern Warfare | 9−10
−1222%
|
110−120
+1222%
|
| Cyberpunk 2077 | 7−8
−2014%
|
148
+2014%
|
| Far Cry 5 | 8−9
−1363%
|
110−120
+1363%
|
| Forza Horizon 4 | 24−27
−888%
|
230−240
+888%
|
| Hitman 3 | 9−10
−1333%
|
120−130
+1333%
|
| Horizon Zero Dawn | 27−30
−989%
|
294
+989%
|
| Shadow of the Tomb Raider | 14−16
−2253%
|
353
+2253%
|
| The Witcher 3: Wild Hunt | 16−18
−1206%
|
209
+1206%
|
| Watch Dogs: Legion | 40−45
−253%
|
150−160
+253%
|
Full HD
Epic Preset
| Red Dead Redemption 2 | 10−11
−1110%
|
120−130
+1110%
|
1440p
High Preset
| Battlefield 5 | 7−8
−2257%
|
160−170
+2257%
|
| Far Cry New Dawn | 6−7
−1733%
|
110−120
+1733%
|
1440p
Ultra Preset
| Assassin's Creed Odyssey | 4−5
−1925%
|
80−85
+1925%
|
| Call of Duty: Modern Warfare | 3−4
−2600%
|
80−85
+2600%
|
| Cyberpunk 2077 | 2−3
−4800%
|
98
+4800%
|
| Far Cry 5 | 5−6
−1520%
|
80−85
+1520%
|
| Forza Horizon 4 | 4−5
−6675%
|
270−280
+6675%
|
| Hitman 3 | 8−9
−1150%
|
100−105
+1150%
|
| Horizon Zero Dawn | 9−10
−2467%
|
231
+2467%
|
| The Witcher 3: Wild Hunt | 3−4
−5100%
|
156
+5100%
|
| Watch Dogs: Legion | 24−27
−856%
|
230−240
+856%
|
1440p
Epic Preset
| Red Dead Redemption 2 | 8−9
−1325%
|
110−120
+1325%
|
4K
High Preset
| Battlefield 5 | 2−3
−4200%
|
85−90
+4200%
|
| Far Cry New Dawn | 2−3
−3350%
|
65−70
+3350%
|
| Hitman 3 | 0−1 | 60−65 |
| Metro Exodus | 0−1 | 100−110 |
4K
Ultra Preset
| Assassin's Creed Odyssey | 3−4
−1767%
|
55−60
+1767%
|
| Assassin's Creed Valhalla | 2−3
−2600%
|
50−55
+2600%
|
| Call of Duty: Modern Warfare | 1−2
−5000%
|
50−55
+5000%
|
| Cyberpunk 2077 | 0−1 | 45 |
| Far Cry 5 | 2−3
−2400%
|
50−55
+2400%
|
| Forza Horizon 4 | 2−3
−5800%
|
110−120
+5800%
|
| Watch Dogs: Legion | 1−2
−4300%
|
40−45
+4300%
|
4K
Epic Preset
| Red Dead Redemption 2 | 5−6
−1380%
|
70−75
+1380%
|
1440p
Ultra Preset
| Assassin's Creed Valhalla | 85−90
+0%
|
85−90
+0%
|
| Metro Exodus | 128
+0%
|
128
+0%
|
| Shadow of the Tomb Raider | 252
+0%
|
252
+0%
|
4K
High Preset
| Horizon Zero Dawn | 220−230
+0%
|
220−230
+0%
|
| The Witcher 3: Wild Hunt | 125
+0%
|
125
+0%
|
4K
Ultra Preset
| Shadow of the Tomb Raider | 131
+0%
|
131
+0%
|
This is how Iris Plus Graphics 645 and RX 7900 GRE compete in popular games:
- RX 7900 GRE is 708% faster in 1080p
- RX 7900 GRE is 1563% faster in 1440p
- RX 7900 GRE is 1480% faster in 4K
Here's the range of performance differences observed across popular games:
- in Forza Horizon 4, with 1440p resolution and the Ultra Preset, the RX 7900 GRE is 6675% faster.
All in all, in popular games:
- RX 7900 GRE is ahead in 63 tests (91%)
- there's a draw in 6 tests (9%)
Pros & cons summary
| Performance score | 4.44 | 69.22 |
| Recency | 7 October 2019 | 27 July 2023 |
| Chip lithography | 14 nm | 5 nm |
| Power consumption (TDP) | 15 Watt | 260 Watt |
Iris Plus Graphics 645 has 1633.3% lower power consumption.
RX 7900 GRE, on the other hand, has a 1459% higher aggregate performance score, an age advantage of 3 years, and a 180% more advanced lithography process.
The Radeon RX 7900 GRE is our recommended choice as it beats the Iris Plus Graphics 645 in performance tests.
Should you still have questions concerning choice between the reviewed GPUs, ask them in Comments section, and we shall answer.
Comparisons with similar GPUs
We selected several comparisons of graphics cards with performance close to those reviewed, providing you with more options to consider.
