AMD
Radeon HD 6870 vs GeForce GT 645M
Full comparison of specs, performance and benchmarks
NVIDIA
GeForce GT 645M
Aggregate performance score
We've compared HD 6870 and GeForce GT 645M across specs and all relevant benchmarks.
↗HD 6870 outperforms GeForce GT 645M by ~7% on the catalog index; this is not a measured FPS gain.+7%
Scores are normalized on the Head to Head scale. Higher is better. How is this calculated?H2HBench Data Quality
Low confidenceSpecifications: Field verification not recordedVerified gaming results: 0Estimated / unverified results: 32Price record updated: Sep 6, 2026
Limited verified data
H2HBench Verdict
Higher catalog score: Radeon HD 6870 (~12%)
The score difference is not a measured FPS improvement.
Reasons to consider HD 6870
- Higher catalog performance index
- More graphics memory
- Higher catalog value index
- Recorded feature support: OpenCL 1.2 · Not supported
Reasons to consider GeForce GT 645M
- Lower stated power consumption
- Recorded feature support: OpenCL 3.0, CUDA 3.0 · Not supported
Catalog metrics radar
Axes with missing data are hidden; every value uses a fixed scale.
AMD
NVIDIAPerformance
Efficiency
Price / performance
Memory capacity
3230
71100
10054
5643
Graphics card ranking
Positions 229–234of 321
Which should you choose?
Two practical conclusions based on community votes and gaming value.
Radeon HD 6870
164 likesHead to Head visitors currently choose this model more often.
Overview
Scores are calculated from specifications, performance, and efficiency.
GamesDirectX, OpenCL, and Vulkan performance
32Better
30
Professional applications3D modeling, video editing, and rendering
29Better
28
AI and machine learningMachine-learning and AI capabilities
27Better
26
Power efficiencyPower consumption across workloads
71
100Better
Head to Head scoreOverall catalog score
47Better
42
Specifications
The better numeric value is highlighted in green, taking the metric direction into account.
DisplayPort
HDMI
Device class
Max monitors
Max resolution
USB Type-C
DirectX
OpenGL
Power consumptionBetter
TFLOPSBetter
Release date
Memory type
Power connector
Architecture
Thickness
Compute API
Launch price—
Shader units / coresBetter
Process nodeBetter
Clock speedBetter
Base clockBetter
Boost clockBetter
VRAMBetter
Memory frequencyBetter
Memory busBetter
Memory bandwidthBetter
Interface
Power consumptionBetter
Recommended PSU
Length
Die sizeBetter
Transistor countBetter
Memory cache
Vulkan
Upscaling
Gaming FPS
Available results are shown separately; missing data is not treated as zero.
The Gaming FPS section compares HD 6870 and GeForce GT 645M across curated H2H Lab game presets. The useful signal is not only average FPS, but also how each device behaves at 1440p and 4K, how memory capacity and bus width affect heavy textures, and whether the game engine favors raster performance, ray tracing, or driver maturity.
HD 6870GeForce GT 645M
Verified externalEstimatedSources ↗
Counter-Strike 2
1080p High
164 FPS
153 FPS
1080p Ultra
112 FPS
107 FPS
1440p Ultra
63 FPS
58 FPS
4K Ultra
23 FPS
21 FPS
Counter-Strike 2HD 6870164 FPSGeForce GT 645M153 FPSHD 6870112 FPSGeForce GT 645M107 FPSHD 687063 FPSGeForce GT 645M58 FPSHD 687023 FPSGeForce GT 645M21 FPS
Cyberpunk 2077HD 6870106 FPSGeForce GT 645M98 FPSHD 687088 FPSGeForce GT 645M85 FPSHD 687046 FPSGeForce GT 645M42 FPSHD 687016 FPSGeForce GT 645M14 FPS
Forza Horizon 5HD 6870133 FPSGeForce GT 645M124 FPSHD 687084 FPSGeForce GT 645M80 FPSHD 687057 FPSGeForce GT 645M52 FPSHD 687034 FPSGeForce GT 645M30 FPS
Hogwarts LegacyHD 687086 FPSGeForce GT 645M80 FPSHD 687070 FPSGeForce GT 645M67 FPSHD 687041 FPSGeForce GT 645M37 FPSHD 687016 FPSGeForce GT 645M14 FPS
H2H workload indices
Comparable internal indices on a fixed 0–100 scale.
H2H Raster IndexH2H Index / 10032306%
H2H Compute IndexH2H Index / 100353112%
H2H Rendering IndexH2H Index / 100393414%
H2H Memory Workload IndexH2H Index / 100564326%
H2H Efficiency IndexH2H Index / 1007110034%
These are versioned H2H calculated indices derived from normalized catalog data. They are not results from a third-party benchmark.
H2H AI workload indices
Estimated workload profiles based on available performance and memory data.
H2H Image Generation IndexH2H Index / 100433618%
H2H ML Training IndexH2H Index / 100413516%
H2H Inference IndexH2H Index / 100393414%
H2H Local LLM IndexH2H Index / 100453720%
H2H Computer Vision IndexH2H Index / 100393414%
These are versioned H2H calculated indices derived from normalized catalog data. They are not results from a third-party benchmark.
Graphics APIs, SDKs and upscaling
DirectX11.011.0
VulkanNot supported1.2
OpenGL4.44.6
UpscalingNot supportedNot supported
Compute APIOpenCL 1.2OpenCL 3.0, CUDA 3.0
Architecture and release
ArchitectureTeraScale 2Kepler / Fermi
Process node40 nm28 nmBetter
Release date20102012
Device classDesktopMobile
GPU cores, die and clocks
Transistor count1700 millionBetter1270 million
Die size255 mm²118 mm²Better
Shader units / cores1120Better384
Base clock900 MHzBetter709 MHz
Boost clock900 MHzBetter780 MHz
Board size, power and compatibility
InterfacePCIe 2x16PCIe 3.0 x16
Length247 mmOEM dependent
ThicknessDual-slotIGP
Recommended PSU450 WOEM dependent
Power connector6+6 pinNone
Display outputs and limits
HDMIHDMI 1.3aOEM dependent
DisplayPortmini-DisplayPort 1.1OEM dependent
USB Type-CNoOEM dependent
Max monitors5OEM dependent
Max resolution4096 × 2160Depends on host system
Memory and compute throughput
VRAM1 GB GDDR52 GB DDR3Better
Memory typeGDDR5GDDR5 / DDR3
Memory bus256 bitBetter128 bit
TFLOPS2.016Better0.599
Other comparisons
Reviews and questions
Explain this comparison
Beyond percentages: causes, relevant specifications, and practical impact behind every chart.
What AI will explain
Overall score, radar, FPS, synthetic tests, specifications, efficiency, and value.
Evidence details
Data coverage
- Verified gaming results
- 0
- Verified synthetic results
- 0
- Games with verified results
- 0
- Verified community results
- 0
- Estimated / unverified results
- 32
- Specifications
- 0 / 69
Calculated scores · How is this calculated?
Scores use the catalog model and may include estimated inputs. Open each score to see its origin and the methodology.
clamp(round(performance × 0.7 + (efficiency ?? 50) × 0.2 + (value is missing ? 0 : (value − 50) × 0.2)), 0, 100)Price evidence · View sources (4)
Verified community results
No verified community benchmarks yet.
Reviewed by
No individual editorial review is recorded for this comparison.
Comparison history
Show recorded changes (3)
- · Record updated: products
- · Record updated: products
- · Record updated: products
Why you can trust this comparison
Origin and confidence are evaluated from the evidence attached to each value. Unverified results are identified, and specification, benchmark and price dates remain separate.
Owner experiences
Real builds, results, and community feedback.
Moderator reviewedHelpful to the communityExpert badges
Frequently asked comparison questions
Short recommendations based on performance, memory, power consumption, and intended use.
01Which is better for gaming: HD 6870 or GeForce GT 645M?+
HD 6870 has the higher overall gaming score, while HD 6870 offers the better price-to-performance ratio. The final choice depends on resolution and settings.
02Which is better for streaming?+
GeForce GT 645M is the stronger streaming choice thanks to performance, hardware encoding, and application support. Check AV1, H.264, and HEVC support before buying.
03Which is better for Blender?+
GeForce GT 645M is generally the better option for Blender and GPU rendering. Rendering-engine support and available VRAM also matter.
04Which is better for video editing?+
HD 6870 offers more overall performance, while HD 6870 offers more memory headroom. Codecs, hardware encoders, and editor optimization can change the result.
05Which is better for neural networks and AI?+
GeForce GT 645M is the more practical option for local AI workloads. VRAM capacity, compute libraries, and framework compatibility are especially important.
06Which is better for 1080p?+
HD 6870 is the most rational 1080p choice, where high frame rates and cost per frame matter most.
07Which is better for 1440p?+
HD 6870 leads in combined 1440p performance. HD 6870 can be preferable for heavy textures and games with high VRAM usage.
08Which is better for 4K?+
HD 6870 is preferable for 4K, where total performance, memory bandwidth, and VRAM capacity have the greatest impact.
09Which is better for a quiet PC?+
GeForce GT 645M is easier to use in a quiet build because of its lower estimated power and thermal load. Actual noise depends on the specific cooler.
10Which is better without replacing the power supply?+
GeForce GT 645M is the safer candidate because its stated power consumption is lower. Verify PSU wattage, age, and power connectors.
11Is it worth upgrading from the previous generation?+
Consider upgrading to HD 6870 if your current device no longer delivers the required FPS, memory capacity, or feature support. A gain below 15–20% is usually worth waiting for a price cut.