Radeon RX 6600 XT vs HD 6990M

Place in the ranking	617	90
Place by popularity	not in top-100	93
Cost-effectiveness evaluation	no data	63.09
Power efficiency	3.61	18.37
Architecture	TeraScale 2 (2009−2015)	RDNA 2.0 (2020−2024)
GPU code name	Blackcomb	Navi 23
Market segment	Laptop	Desktop
Release date	12 July 2011 (13 years ago)	30 July 2021 (3 years ago)
Launch price (MSRP)	no data	$379

Cost-effectiveness evaluation

Performance to price ratio. The higher, the better.

no data

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	1120	2048
Core clock speed	715 MHz	1968 MHz
Boost clock speed	no data	2589 MHz
Number of transistors	1,700 million	11,060 million
Manufacturing process technology	40 nm	7 nm
Power consumption (TDP)	100 Watt	160 Watt
Texture fill rate	40.04	331.4
Floating-point processing power	1.602 TFLOPS	10.6 TFLOPS
ROPs	32	64
TMUs	56	128
Ray Tracing Cores	no data	32

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).

Laptop size	large	no data
Interface	MXM-B (3.0)	PCIe 4.0 x8
Length	no data	190 mm
Width	no data	2-slot
Supplementary power connectors	None	1x 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	GDDR5	GDDR6
Maximum RAM amount	2 GB	8 GB
Memory bus width	256 Bit	128 Bit
Memory clock speed	900 MHz	2000 MHz
Memory bandwidth	115.2 GB/s	256.0 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	No outputs	1x HDMI, 2x DisplayPort
HDMI	-	+

API compatibility

List of supported 3D and general-purpose computing APIs, including their specific versions.

DirectX	11.2 (11_0)	12.0 Ultimate (12_2)
Shader Model	5.0	6.5
OpenGL	4.4	4.6
OpenCL	1.2	2.1
Vulkan	N/A	1.2

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.

HD 6990M 5.26

RX 6600 XT 42.86
+715%

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.

HD 6990M 3227

RX 6600 XT 39051
+1110%

3DMark Vantage Performance

3DMark Vantage is an outdated DirectX 10 benchmark using 1280x1024 screen resolution. It taxes the graphics card with two scenes, one depicting a girl escaping some militarized base located within a sea cave, the other displaying a space fleet attack on a defenseless planet. It was discontinued in April 2017, and Time Spy benchmark is now recommended to be used instead.

HD 6990M 15113

RX 6600 XT 88163
+483%

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:

900p	54 −641%	400−450 +641%
Full HD	59 −129%	135 +129%
1440p	9−10 −733%	75 +733%
4K	5−6 −780%	44 +780%

Cost per frame, $

1080p	no data	2.81
1440p	no data	5.05
4K	no data	8.61

FPS performance in popular games

Full HD
Low Preset

Cyberpunk 2077

9−10

−778%

79
+778%

Full HD
Medium Preset

Assassin's Creed Odyssey	14−16 −543%	90−95 +543%
Assassin's Creed Valhalla	6−7 −2050%	129 +2050%
Battlefield 5	14−16 −879%	130−140 +879%
Call of Duty: Modern Warfare	10−12 −682%	85−90 +682%
Cyberpunk 2077	9−10 −767%	78 +767%
Far Cry 5	10−12 −727%	90−95 +727%
Far Cry New Dawn	14−16 −600%	100−110 +600%
Forza Horizon 4	30−35 −503%	190−200 +503%
Hitman 3	10−12 −882%	108 +882%
Horizon Zero Dawn	30−35 −427%	170−180 +427%
Metro Exodus	12−14 −923%	130−140 +923%
Red Dead Redemption 2	14−16 −593%	95−100 +593%
Shadow of the Tomb Raider	18−20 −737%	150−160 +737%
Watch Dogs: Legion	45−50 −183%	130−140 +183%

Full HD
High Preset

Assassin's Creed Odyssey	14−16 −543%	90−95 +543%
Assassin's Creed Valhalla	6−7 −1667%	106 +1667%
Battlefield 5	14−16 −879%	130−140 +879%
Call of Duty: Modern Warfare	10−12 −682%	85−90 +682%
Cyberpunk 2077	9−10 −744%	76 +744%
Far Cry 5	10−12 −727%	90−95 +727%
Far Cry New Dawn	14−16 −600%	100−110 +600%
Forza Horizon 4	30−35 −503%	190−200 +503%
Hitman 3	10−12 −882%	108 +882%
Horizon Zero Dawn	30−35 −427%	170−180 +427%
Metro Exodus	12−14 −923%	130−140 +923%
Red Dead Redemption 2	14−16 −593%	95−100 +593%
Shadow of the Tomb Raider	18−20 −1000%	209 +1000%
The Witcher 3: Wild Hunt	18−20 −389%	85−90 +389%
Watch Dogs: Legion	45−50 −183%	130−140 +183%

Full HD
Ultra Preset

Assassin's Creed Odyssey	14−16 −543%	90−95 +543%
Assassin's Creed Valhalla	6−7 −1150%	75 +1150%
Call of Duty: Modern Warfare	10−12 −682%	85−90 +682%
Cyberpunk 2077	9−10 −667%	69 +667%
Far Cry 5	10−12 −727%	90−95 +727%
Forza Horizon 4	30−35 −503%	190−200 +503%
Hitman 3	10−12 −809%	100 +809%
Horizon Zero Dawn	30−35 −376%	157 +376%
Shadow of the Tomb Raider	18−20 −863%	183 +863%
The Witcher 3: Wild Hunt	18−20 −450%	99 +450%
Watch Dogs: Legion	45−50 −29.8%	61 +29.8%

Full HD
Epic Preset

Red Dead Redemption 2

14−16

−593%

95−100
+593%

1440p
High Preset

Battlefield 5	10−11 −730%	80−85 +730%
Far Cry New Dawn	8−9 −713%	65−70 +713%

1440p
Ultra Preset

Assassin's Creed Odyssey	5−6 −840%	45−50 +840%
Assassin's Creed Valhalla	0−1	56
Call of Duty: Modern Warfare	5−6 −900%	50−55 +900%
Cyberpunk 2077	2−3 −1900%	40 +1900%
Far Cry 5	6−7 −717%	45−50 +717%
Forza Horizon 4	12−14 −1708%	230−240 +1708%
Hitman 3	9−10 −644%	67 +644%
Horizon Zero Dawn	12−14 −867%	116 +867%
Metro Exodus	3−4 −3167%	98 +3167%
The Witcher 3: Wild Hunt	4−5 −1500%	60−65 +1500%
Watch Dogs: Legion	30−35 −512%	200−210 +512%

1440p
Epic Preset

Red Dead Redemption 2

9−10

−722%

70−75
+722%

4K
High Preset

Battlefield 5	4−5 −975%	40−45 +975%
Far Cry New Dawn	3−4 −1133%	35−40 +1133%
Hitman 3	1−2 −3200%	33 +3200%
Horizon Zero Dawn	9−10 −2022%	190−200 +2022%
Metro Exodus	2−3 −2700%	55−60 +2700%
The Witcher 3: Wild Hunt	1−2 −5300%	54 +5300%

4K
Ultra Preset

Assassin's Creed Odyssey	3−4 −900%	30−33 +900%
Assassin's Creed Valhalla	2−3 −1300%	28 +1300%
Call of Duty: Modern Warfare	2−3 −1300%	27−30 +1300%
Cyberpunk 2077	0−1	14
Far Cry 5	3−4 −733%	24−27 +733%
Forza Horizon 4	4−5 −1400%	60−65 +1400%
Watch Dogs: Legion	2−3 −1100%	24 +1100%

4K
Epic Preset

Red Dead Redemption 2

6−7

−550%

35−40
+550%

1440p
Ultra Preset

Shadow of the Tomb Raider

118

+0%

118

+0%

4K
Ultra Preset

Shadow of the Tomb Raider

+0%

This is how HD 6990M and RX 6600 XT compete in popular games:

RX 6600 XT is 641% faster in 900p
RX 6600 XT is 129% faster in 1080p
RX 6600 XT is 733% faster in 1440p
RX 6600 XT is 780% faster in 4K

Here's the range of performance differences observed across popular games:

in The Witcher 3: Wild Hunt, with 4K resolution and the High Preset, the RX 6600 XT is 5300% faster.

All in all, in popular games:

RX 6600 XT is ahead in 68 tests (97%)
there's a draw in 2 tests (3%)

Pros & cons summary

Performance score	5.26	42.86
Recency	12 July 2011	30 July 2021
Maximum RAM amount	2 GB	8 GB
Chip lithography	40 nm	7 nm
Power consumption (TDP)	100 Watt	160 Watt

HD 6990M has 60% lower power consumption.

RX 6600 XT, on the other hand, has a 714.8% higher aggregate performance score, an age advantage of 10 years, a 300% higher maximum VRAM amount, and a 471.4% more advanced lithography process.

The Radeon RX 6600 XT is our recommended choice as it beats the Radeon HD 6990M in performance tests.

Be aware that Radeon HD 6990M is a notebook card while Radeon RX 6600 XT is a desktop one.

Should you still have questions concerning choice between the reviewed GPUs, ask them in Comments section, and we shall answer.