Moving from an RX 5600 XT to an RX 6600 is a modest upgrade: expect roughly 5-18% more performance at 1080p depending on the game and settings, plus 2 GB more VRAM, much lower power draw, and, most importantly, hardware ray tracing support that lets you run newer games the RX 5600 XT cannot launch. It pays off for 1080p players who hit VRAM limits or want those newer titles; anyone wanting a big jump in frame rates should skip ahead to a current card instead.
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RDNA 1 to RDNA 2: What the Spec Sheet Hides
On paper the RX 6600 looks like a step backward. It has 1792 stream processors versus 2304 on the RX 5600 XT, a narrower 128-bit bus instead of 192-bit, and less raw bandwidth at 224 GB/s versus 288 GB/s. It also uses a PCIe 4.0 x8 link instead of x16. What closes the gap is RDNA 2: much higher clock speeds, with a 2491 MHz boost versus 1560 MHz, and a 32 MB Infinity Cache that reduces how often the GPU needs to go out to memory.
The RX 6600 also adds features RDNA 1 never had: hardware ray accelerators, full DirectX 12 Ultimate support including mesh shaders and variable-rate shading, and eligibility for AMD’s future FSR 4.1 rollout to the RX 6000 series.
| Specification | RX 5600 XT | RX 6600 |
|---|---|---|
| Architecture | RDNA 1.0 | RDNA 2.0 |
| Release date | 21 January 2020 | 13 October 2021 |
| Launch MSRP | $279 | $329 |
| Stream processors | 2304 | 1792 |
| Boost clock | 1560 MHz | 2491 MHz |
| Process | 7 nm | 7 nm |
| TDP | 150 W | 132 W |
| VRAM | 6 GB GDDR6 | 8 GB GDDR6 |
| Memory bus | 192-bit | 128-bit |
| Bandwidth | 288.0 GB/s | 224.0 GB/s |
| Cache | 3 MB L2 | 2 MB L2 + 32 MB L3 (Infinity Cache) |
| Interface | PCIe 4.0 x16 | PCIe 4.0 x8 |
| Power connector | 1x 8-pin | 1x 8-pin |
| Length (reference) | 267 mm | 190 mm |
| Width | 2-slot | 2-slot |
| Outputs | 1x HDMI, 3x DisplayPort | 1x HDMI, 3x DisplayPort |
Performance: Small at Launch, Larger in Newer Games
Launch reviews in October 2021 were unimpressed. Hardware Unboxed/TechSpot found the RX 6600 roughly matching the RX 5600 XT at 1080p and about 6% faster at 1440p, at a higher price. Tom’s Hardware measured it about 6% faster at 1080p while using about half the power.
The picture improved with time. TechSpot’s 2025 retest across newer games found the RX 6600 about 11% faster than the RX 5600 XT at 1080p with high presets and about 18% faster with low-to-medium presets. At 1440p with higher presets, the gap grew to around 21%, largely because the RX 5600 XT frequently ran out of its 6 GB of memory. In the most extreme VRAM-bound cases, such as Black Ops 6 at its highest preset at 1440p, the RX 6600 was more than twice as fast, while in lighter titles like Rainbow Six Siege the two cards were roughly even.
A fair summary is a 5-18% gain at 1080p for typical modern games, with occasional much larger wins when 6 GB is exhausted. As an illustration, a game at about 60 fps on the RX 5600 XT at 1080p high would typically land around 66-70 fps on the RX 6600. Real results vary with settings, CPU, patches and drivers.
Ray Tracing and Games the RX 5600 XT Cannot Run
The RX 5600 XT has no ray tracing hardware at all, and it lacks full DirectX 12 Ultimate support. That is becoming a hard barrier. Games that require hardware ray tracing, such as Indiana Jones and the Great Circle and Doom: The Dark Ages, will not run on RDNA 1. The RX 6600’s ray accelerators satisfy those requirements, allowing these titles to run at 1080p with low-to-medium settings and upscaling.
The RX 6600 is not a strong ray tracing card. Optional ray tracing effects in most games cost a large share of performance on it and are usually best left off. The value here is compatibility, not ray-traced visuals.
Upscaling: FSR 4.1 Is Coming for One of These Cards
Both cards support FSR 2 and FSR 3 upscaling, FSR 3 frame generation in supported games, and Intel XeSS. The difference is the roadmap. AMD brought FSR 4.1 machine-learning upscaling to the RX 7000 series in June 2026 and has announced it for the RX 6000 series in early 2027. RDNA 1 cards such as the RX 5600 XT have not been included in those announcements. If FSR 4.1 arrives on the RX 6600 as planned, image quality at 1080p with upscaling should improve noticeably, which extends the card’s useful life.
VRAM: Why 6 GB Is the Real Problem
For many RX 5600 XT owners, memory is the issue they actually feel. A practical guide for 2026:
- 1080p low/medium: 6 GB is still workable in most games.
- 1080p high: many recent titles want 7-8 GB, so the RX 6600’s 8 GB avoids stutter and texture pop-in.
- 1440p: 6 GB frequently runs out; 8 GB is tight but more usable at medium settings.
One caveat: the RX 6600’s PCIe 4.0 x8 link. On older PCIe 3.0 motherboards, an x8 card gets half the bandwidth of a PCIe 4.0 x8 slot. That rarely matters when the game fits in VRAM, but in memory-overflow scenarios the penalty can be noticeable. Users on PCIe 3.0 platforms should keep texture settings within the 8 GB budget.
Power, Heat and Case Fit
The RX 6600 is much more efficient. TechPowerUp called it the most energy-efficient graphics card it had tested at launch, measuring around 120 W while gaming. Using the formula GPU TDP + CPU power + about 150 W of headroom with a 105 W CPU:
- RX 5600 XT: 150 + 105 + 150 = 405 W, so a quality 450-500 W unit works.
- RX 6600: 132 + 105 + 150 = 387 W, so a quality 450 W unit is enough.
Both use a single 8-pin connector, so no cabling changes are needed. The RX 6600’s reference length of 190 mm versus 267 mm for the RX 5600 XT makes it easy to fit in compact and small-form-factor cases, and many partner models are short dual-fan designs that run quietly.
Cost per Performance and Used Prices
At launch, the RX 6600 was worse value. Indexing the RX 5600 XT at 100 and the RX 6600 at about 105 based on launch reviews:
- RX 5600 XT: $279 / 100 = about $2.79 per performance point.
- RX 6600: $329 / 105 = about $3.13 per performance point.
The used market changes that. In 2026 an RX 5600 XT typically sells for roughly $80-$120, while an RX 6600 typically sells for roughly $140-$190. Selling the old card means a net upgrade cost of roughly $50-$100, which is reasonable given the extra VRAM and game compatibility. Check that the RX 6600 is the standard model and not a mining-worn unit with failing fans.
Is the Upgrade Worth It for You?
| Your situation | Recommendation |
|---|---|
| 1080p, VRAM warnings or stutter in new games | Upgrade to the RX 6600 |
| Want games that require ray tracing hardware | Upgrade; the RX 5600 XT cannot run them |
| Mostly esports and older games | Keep the RX 5600 XT |
| Want a large frame-rate increase | Skip to a current card such as the RX 9060 XT, RTX 5060 or Arc B580 |
| Compact case or low power budget | RX 6600 is a clear improvement |
| Targeting 1440p | Neither; look at a 12-16 GB card |
Frequently Asked Questions
How much faster is the RX 6600 than the RX 5600 XT?
Launch reviews showed the RX 6600 roughly equal to about 6% faster at 1080p. TechSpot’s 2025 retest found an 11-18% advantage at 1080p in newer games and around 21% at 1440p, mostly because the RX 5600 XT’s 6 GB runs out. Gains vary widely by game.
Can the RX 5600 XT run ray tracing games?
No. RDNA 1 has no ray tracing hardware, so games that require it, such as Indiana Jones and the Great Circle and Doom: The Dark Ages, will not run. The RX 6600 supports hardware ray tracing and can run these titles at modest settings.
Will the RX 6600 get FSR 4?
AMD has announced FSR 4.1 for the RX 6000 series in early 2027, following its June 2026 release for the RX 7000 series. The RX 5600 XT has not been included in those announcements.
Does the RX 6600 lose performance on a PCIe 3.0 motherboard?
Usually very little, as long as the game fits in 8 GB of VRAM. When memory overflows, the narrower PCIe 3.0 x8 link can make stutter worse. Keeping texture settings within the memory budget avoids most of the issue.
Do I need a new power supply for the RX 6600?
No. The RX 6600 is rated at 132 W, lower than the RX 5600 XT’s 150 W, and uses the same single 8-pin connector. Any quality 450 W or larger power supply that ran the RX 5600 XT is sufficient.
