NVIDIA
GeForce GT 640 vs Radeon HD 7990
Full comparison of specs, performance and benchmarks
AMD
HD 7990
Aggregate performance score
We've compared GT 640 and HD 7990 across specs and all relevant benchmarks.
↗HD 7990 outperforms GT 640 by ~19% on the catalog index; this is not a measured FPS gain.+19%
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: GeForce GT 640 (~21%)
The score difference is not a measured FPS improvement.
Reasons to consider GT 640
- Lower stated power consumption
- Lower recorded market price
- Recorded feature support: OpenCL 3.0, CUDA 3.0 · Not supported
Reasons to consider HD 7990
- Higher catalog performance index
- More graphics memory
- Recorded feature support: OpenCL 1.2 · Not supported
Catalog metrics radar
Axes with missing data are hidden; every value uses a fixed scale.
NVIDIA
AMDPerformance
Efficiency
Price / performance
Memory capacity
3137
10033
100100
4360
Graphics card ranking
Positions 136–141of 321
Which should you choose?
Two practical conclusions based on community votes and gaming value.
GeForce GT 640
126 likesHead to Head visitors currently choose this model more often.
Overview
Scores are calculated from specifications, performance, and efficiency.
GamesDirectX, OpenCL, and Vulkan performance
31
37Better
Professional applications3D modeling, video editing, and rendering
29
33Better
AI and machine learningMachine-learning and AI capabilities
26
31Better
Power efficiencyPower consumption across workloads
100Better
33
Head to Head scoreOverall catalog score
52Better
43
Specifications
The better numeric value is highlighted in green, taking the metric direction into account.
HDMI
DisplayPort
Device class
Max monitors
USB Type-C
OpenGL
DirectX
Vulkan
TFLOPSBetter
Power consumptionBetter
Memory type
Power connector
Release date
Architecture
Thickness
Max resolution
Compute API
Launch priceBetter
Shader units / coresBetter
Process node
Clock speedBetter
Base clockBetter
Boost clockBetter
VRAMBetter
Memory frequencyBetter
Memory busBetter
Memory bandwidthBetter
Interface
Power consumptionBetter
Recommended PSUBetter
LengthBetter
Die sizeBetter
Memory cache
Transistor countBetter
Upscaling
Gaming FPS
Available results are shown separately; missing data is not treated as zero.
The Gaming FPS section compares GT 640 and HD 7990 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.
GT 640HD 7990
Verified externalEstimatedSources ↗
Counter-Strike 2
1080p High
156 FPS
180 FPS
1080p Ultra
109 FPS
127 FPS
1440p Ultra
59 FPS
83 FPS
4K Ultra
21 FPS
26 FPS
Counter-Strike 2GT 640156 FPSHD 7990180 FPSGT 640109 FPSHD 7990127 FPSGT 64059 FPSHD 799083 FPSGT 64021 FPSHD 799026 FPS
Cyberpunk 2077GT 640100 FPSHD 7990116 FPSGT 64086 FPSHD 7990100 FPSGT 64043 FPSHD 799060 FPSGT 64014 FPSHD 799018 FPS
Forza Horizon 5GT 640127 FPSHD 7990147 FPSGT 64082 FPSHD 799095 FPSGT 64053 FPSHD 799075 FPSGT 64031 FPSHD 799039 FPS
Hogwarts LegacyGT 64082 FPSHD 799095 FPSGT 64069 FPSHD 799079 FPSGT 64038 FPSHD 799054 FPSGT 64014 FPSHD 799018 FPS
H2H workload indices
Comparable internal indices on a fixed 0–100 scale.
H2H Raster IndexH2H Index / 100313718%
H2H Compute IndexH2H Index / 100334019%
H2H Rendering IndexH2H Index / 100344426%
H2H Memory Workload IndexH2H Index / 100436033%
H2H Efficiency IndexH2H Index / 10010033101%
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 / 100364829%
H2H ML Training IndexH2H Index / 100364624%
H2H Inference IndexH2H Index / 100344426%
H2H Local LLM IndexH2H Index / 100385027%
H2H Computer Vision IndexH2H Index / 100354423%
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
DirectX11.011.1
Vulkan1.21.2
OpenGL4.64.6
UpscalingNot supportedNot supported
Compute APIOpenCL 3.0, CUDA 3.0OpenCL 1.2
Architecture and release
ArchitectureKeplerGCN 1.0
Process node28 nm28 nm
Release date20122013
Device classDesktopDesktop
GPU cores, die and clocks
Transistor count1270 million4313 millionBetter
Die size118 mm²Better365 mm²
Shader units / cores3842048Better
Base clock900 MHz950 MHzBetter
Boost clock900 MHz1000 MHzBetter
Board size, power and compatibility
InterfacePCIe 3x16PCIe 3x16
Length145 mmBetter304 mm
ThicknessSingle-slotDual-slot
Recommended PSU250 WBetter750 W
Power connectorNone8+8 pin
Display outputs and limits
HDMIHDMI 1.4aBoard dependent
DisplayPortDisplayPort 1.2mini-DisplayPort 1.2
USB Type-CNoNo
Max monitors35
Max resolution4096 × 21604096 × 2160
Memory and compute throughput
VRAM2 GB GDDR36 GB GDDR5Better
Memory typeGDDR3GDDR5
Memory bus128 bit384x2 bitBetter
TFLOPS0.6934.096Better
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 / 70
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 (5)
Verified community results
No verified community benchmarks yet.
Reviewed by
No individual editorial review is recorded for this comparison.
Comparison history
Show recorded changes (4)
- · Record updated: products
- · 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: GT 640 or HD 7990?+
GT 640 has the higher overall gaming score, while GT 640 offers the better price-to-performance ratio. The final choice depends on resolution and settings.
02Which is better for streaming?+
GT 640 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?+
GT 640 is generally the better option for Blender and GPU rendering. Rendering-engine support and available VRAM also matter.
04Which is better for video editing?+
GT 640 offers more overall performance, while GT 640 offers more memory headroom. Codecs, hardware encoders, and editor optimization can change the result.
05Which is better for neural networks and AI?+
GT 640 is the more practical option for local AI workloads. VRAM capacity, compute libraries, and framework compatibility are especially important.
06Which is better for 1080p?+
GT 640 is the most rational 1080p choice, where high frame rates and cost per frame matter most.
07Which is better for 1440p?+
GT 640 leads in combined 1440p performance. GT 640 can be preferable for heavy textures and games with high VRAM usage.
08Which is better for 4K?+
GT 640 is preferable for 4K, where total performance, memory bandwidth, and VRAM capacity have the greatest impact.
09Which is better for a quiet PC?+
GT 640 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?+
GT 640 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 GT 640 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.