AMD
Radeon RX 6600 XT vs Radeon HD 7990
Full comparison of specs, performance and benchmarks
AMD
HD 7990
Aggregate performance score
We've compared RX 6600 XT and HD 7990 across specs and all relevant benchmarks.
↗RX 6600 XT outperforms HD 7990 by ~16% on the catalog index; this is not a measured FPS gain.+16%
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 RX 6600 XT (~16%)
The score difference is not a measured FPS improvement.
Reasons to consider RX 6600 XT
- Higher catalog performance index
- More graphics memory
- Lower stated power consumption
- Recorded feature support: OpenCL 2.1 · FSR
Reasons to consider HD 7990
- Higher catalog value index
- Recorded feature support: OpenCL 1.2 · Not supported
Catalog metrics radar
Axes with missing data are hidden; every value uses a fixed scale.
AMDPerformance
Efficiency
Price / performance
Memory capacity
4337
9033
60100
6860
Graphics card ranking
Positions 73–78of 321
Which should you choose?
Two practical conclusions based on community votes and gaming value.
Radeon HD 7990
118 likesHead to Head visitors currently choose this model more often.
Overview
Scores are calculated from specifications, performance, and efficiency.
GamesDirectX, OpenCL, and Vulkan performance
43Better
37
Professional applications3D modeling, video editing, and rendering
37Better
33
AI and machine learningMachine-learning and AI capabilities
35Better
31
Power efficiencyPower consumption across workloads
90Better
33
Head to Head scoreOverall catalog score
50Better
43
Specifications
The better numeric value is highlighted in green, taking the metric direction into account.
DisplayPort
HDMI
Device class
Upscaling
Max monitors
Max resolution
USB Type-C
DirectX
Vulkan
OpenGL
TFLOPSBetter
Power consumptionBetter
Memory type
Power connector
Release date
ArchitectureBetter
Thickness
Compute API
Launch priceBetter
Shader units / cores
Clock speedBetter
Base clockBetter
Boost clockBetter
VRAMBetter
Memory frequencyBetter
Memory busBetter
Memory bandwidthBetter
Interface
Power consumptionBetter
Process nodeBetter
Recommended PSUBetter
LengthBetter
Die sizeBetter
Memory cache
Transistor countBetter
Gaming FPS
Available results are shown separately; missing data is not treated as zero.
The Gaming FPS section compares RX 6600 XT 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.
RX 6600 XTHD 7990
Verified externalEstimatedSources ↗
Counter-Strike 2
1080p High
205 FPS
180 FPS
1080p Ultra
144 FPS
127 FPS
1440p Ultra
100 FPS
83 FPS
4K Ultra
29 FPS
26 FPS
Counter-Strike 2RX 6600 XT205 FPSHD 7990180 FPSRX 6600 XT144 FPSHD 7990127 FPSRX 6600 XT100 FPSHD 799083 FPSRX 6600 XT29 FPSHD 799026 FPS
Cyberpunk 2077RX 6600 XT133 FPSHD 7990116 FPSRX 6600 XT114 FPSHD 7990100 FPSRX 6600 XT73 FPSHD 799060 FPSRX 6600 XT20 FPSHD 799018 FPS
Forza Horizon 5RX 6600 XT167 FPSHD 7990147 FPSRX 6600 XT108 FPSHD 799095 FPSRX 6600 XT90 FPSHD 799075 FPSRX 6600 XT43 FPSHD 799039 FPS
Hogwarts LegacyRX 6600 XT108 FPSHD 799095 FPSRX 6600 XT91 FPSHD 799079 FPSRX 6600 XT65 FPSHD 799054 FPSRX 6600 XT20 FPSHD 799018 FPS
H2H workload indices
Comparable internal indices on a fixed 0–100 scale.
H2H Raster IndexH2H Index / 100433715%
H2H Compute IndexH2H Index / 100534028%
H2H Rendering IndexH2H Index / 100504413%
H2H Memory Workload IndexH2H Index / 100686013%
H2H Efficiency IndexH2H Index / 100903393%
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 / 100544812%
H2H ML Training IndexH2H Index / 100534614%
H2H Inference IndexH2H Index / 100504413%
H2H Local LLM IndexH2H Index / 100575013%
H2H Computer Vision IndexH2H Index / 100514415%
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
DirectX12.211.1
Vulkan1.41.2
OpenGL4.64.6
UpscalingFSRNot supported
Compute APIOpenCL 2.1OpenCL 1.2
Architecture and release
ArchitectureRDNA 2.0BetterGCN 1.0
Process node7 nmBetter28 nm
Release date20212013
Device classDesktopDesktop
GPU cores, die and clocks
Transistor count11060 millionBetter4313 million
Die size237 mm²Better365 mm²
Shader units / cores20482048
Base clock1968 MHzBetter950 MHz
Boost clock2589 MHzBetter1000 MHz
Board size, power and compatibility
InterfacePCIe 4x8PCIe 3x16
Length190 mmBetter304 mm
ThicknessDual-slotDual-slot
Recommended PSU450 WBetter750 W
Power connector8 pin8+8 pin
Display outputs and limits
HDMIHDMI 2.1Board dependent
DisplayPortDisplayPort 1.4amini-DisplayPort 1.2
USB Type-CNoNo
Max monitors45
Max resolution7680 × 43204096 × 2160
Memory and compute throughput
VRAM8 GB GDDR6Better6 GB GDDR5
Memory typeGDDR6GDDR5
Memory bus128 bit384x2 bitBetter
TFLOPS10.6Better4.096
Other comparisons
GTX 1660 TiNVIDIAReviews 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 (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 (5)
- · Record updated: products
- · Record updated: products
- · Record changed: product_prices
- · 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: RX 6600 XT or HD 7990?+
RX 6600 XT has the higher overall gaming score, while HD 7990 offers the better price-to-performance ratio. The final choice depends on resolution and settings.
02Which is better for streaming?+
RX 6600 XT 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?+
RX 6600 XT is generally the better option for Blender and GPU rendering. Rendering-engine support and available VRAM also matter.
04Which is better for video editing?+
RX 6600 XT offers more overall performance, while RX 6600 XT offers more memory headroom. Codecs, hardware encoders, and editor optimization can change the result.
05Which is better for neural networks and AI?+
RX 6600 XT 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 7990 is the most rational 1080p choice, where high frame rates and cost per frame matter most.
07Which is better for 1440p?+
RX 6600 XT leads in combined 1440p performance. RX 6600 XT can be preferable for heavy textures and games with high VRAM usage.
08Which is better for 4K?+
RX 6600 XT is preferable for 4K, where total performance, memory bandwidth, and VRAM capacity have the greatest impact.
09Which is better for a quiet PC?+
RX 6600 XT 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?+
RX 6600 XT 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 RX 6600 XT 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.