Buying Guide
The Best GPU for 4K Gaming
From the ASRock 7900 XT Phantom Gaming White to the ASUS TUF RTX 5090: four graphics cards ranked on video memory and GPU, with who should skip each one.
By The PC Journal editorial team
11 min read4 products evaluated
Cards with 20GB or more of memory keep 4K textures and ray tracing from running out of space. Every pick has at least 20GB of video memory, ordered with the largest memory first.
This is a research roundup, not a lab test: GPU, VRAM and memory come from each maker's published specs; nothing here was tested in-house, and a missing outputs is flagged, not filled in.
Quick Picks
Our 4 recommendations at a glance. Tap a pick for the full verdict.
Largest Video Memory
ASUS TUF Gaming GeForce RTX 5090
The largest video memory here (32GB).
Best for: Buyers who put video memory first.
Our take Check price for ASUS TUF Gaming GeForce RTX 5090 (opens in a new tab)
Also Consider
ASRock Radeon RX 7900 XTX Phantom Gaming OC 24GB
96MB of Infinity Cache.
Best for: Buyers who want 96MB of Infinity Cache.
Our take Check price for ASRock Radeon RX 7900 XTX Phantom Gaming OC 24GB (opens in a new tab)
Lowest Price Here
ASRock Radeon RX 7900 XT Phantom Gaming White 20GB OC
Undercutting the Sapphire 7900 XT on price when we checked.
Best for: Spending as little as possible.
Our take Check price for ASRock Radeon RX 7900 XT Phantom Gaming White 20GB OC (opens in a new tab)
Strong Alternative
Sapphire AMD Radeon RX 7900 XT 20GB
A USB-C display output.
Best for: Buyers who want USB-C display output.
Our take Check price for Sapphire AMD Radeon RX 7900 XT 20GB (opens in a new tab)
| Pick | Why it’s here | Best for | Price |
|---|---|---|---|
| The largest video memory here (32GB). | Buyers who put video memory first. | Check price for ASUS TUF Gaming GeForce RTX 5090 (opens in a new tab) |
| 96MB of Infinity Cache. | Buyers who want 96MB of Infinity Cache. | Check price for ASRock Radeon RX 7900 XTX Phantom Gaming OC 24GB (opens in a new tab) |
| Undercutting the Sapphire 7900 XT on price when we checked. | Spending as little as possible. | Check price for ASRock Radeon RX 7900 XT Phantom Gaming White 20GB OC (opens in a new tab) |
| A USB-C display output. | Buyers who want USB-C display output. | Check price for Sapphire AMD Radeon RX 7900 XT 20GB (opens in a new tab) |
Our Picks
Largest Video Memory1 of 4
ASUS TUF Gaming GeForce RTX 5090 on Amazon (opens in a new tab)
The ASUS TUF RTX 5090 is in a class of its own with 32GB of GDDR7 and 21,760 CUDA cores.
Best for
- Buyers who put video memory first.
Skip if
- If budget leads, the ASRock 7900 XT Phantom Gaming White was cheaper at our last price check.
Why we like it
At the time of writing it cost several times more than the other cards here, so it only makes sense when nothing slower will do. On video memory it leads this guide at 32GB, ahead of the ASRock 7900 XTX Phantom Gaming (24GB). You get an RTX 5090 gpu here, which sets it apart from the ASRock 7900 XT Phantom Gaming White and its an RX 7900 XT gpu.
No other pick in this guide offers GDDR7 memory; compare the Sapphire 7900 XT, which has GDDR6 memory. It also comes with a 512-bit memory bus at 28Gbps and a GPU holder in the box. No dimensions are published for the ASUS TUF RTX 5090; get length and thickness from the maker's page first. At our last price check it topped the group, with the ASRock 7900 XTX Phantom Gaming the nearest cheaper option.
Key dimensions & specs
- GPU: RTX 5090
- VRAM: 32GB
- Memory: GDDR7
- Outputs: 3 x DisplayPort 2.1b, 2 x HDMI 2.1b
Pros
- 32GB of VRAM, room for large local AI models as well as games
- Faster GDDR7 memory
- 512-bit memory bus at 28Gbps
- 21,760 CUDA cores
Cons
- Costs more than the ASRock 7900 XT Phantom Gaming White at the time of writing
Also Consider2 of 4
ASRock Radeon RX 7900 XTX Phantom Gaming OC 24GB on Amazon (opens in a new tab)
ASRock's Phantom Gaming OC offers a 2615MHz boost, 96MB of Infinity Cache and 0dB silent cooling at light load.
Best for
- Buyers who want 96MB of Infinity Cache.
Skip if
- Worth skipping when calls for a 800W or larger PS is a problem.
Why we like it
It was the least expensive 7900 XTX here at the time of writing. It boosts to 2615MHz with 24GB of GDDR6, 96 compute units and 96MB of Infinity Cache. The Phantom Gaming triple-fan cooler sits on a reinforced metal frame.
Its 24GB video memory ranks second of 4 here, behind the ASUS TUF RTX 5090 (32GB) and ahead of the Sapphire 7900 XT (20GB). No other pick in this guide offers an RX 7900 XTX gpu; compare the Sapphire 7900 XT, which has an RX 7900 XT gpu. It shares GDDR6 memory with the ASRock 7900 XT Phantom Gaming White and Sapphire 7900 XT; the ASUS TUF RTX 5090 goes with GDDR7 memory.
No dimensions are published for the ASRock 7900 XTX Phantom Gaming; get length and thickness from the maker's page first. On price it sat third of 4, between the cheaper Sapphire 7900 XT and the pricier ASUS TUF RTX 5090, at the time of writing.
Key dimensions & specs
- GPU: RX 7900 XTX
- VRAM: 24GB
- Memory: GDDR6
- Recommended PSU: 800W
- Boost clock: 2615MHz
Pros
- 24GB of VRAM, room for large local AI models as well as games
- 96MB of Infinity Cache
- 0dB silent cooling at light load
- RX 7900 XTX gpu, the only one here
Cons
- Calls for a 800W or larger PSU
- Costs more than the ASRock 7900 XT Phantom Gaming White at the time of writing
Lowest Price Here3 of 4
ASRock Radeon RX 7900 XT Phantom Gaming White 20GB OC on Amazon (opens in a new tab)
The Phantom Gaming White is ASRock's white 7900 XT, with a white shroud and backplate on a 320-bit memory bus.
Best for
- Spending as little as possible.
Skip if
- Worth skipping when video memory of 20GB, behind the ASUS TUF RTX 5090 (32GB is a problem.
Why we like it
A reinforced metal frame keeps the card from sagging in the slot. It matches the Sapphire 7900 XT on video memory (20GB). Like the Sapphire 7900 XT, it has an RX 7900 XT gpu, while the ASUS TUF RTX 5090 uses an RTX 5090 gpu.
It shares GDDR6 memory with the ASRock 7900 XTX Phantom Gaming and Sapphire 7900 XT; the ASUS TUF RTX 5090 goes with GDDR7 memory. No dimensions are published for the ASRock 7900 XT Phantom Gaming White; get length and thickness from the maker's page first. Its power connector and recommended PSU are not published, so confirm both for the ASRock 7900 XT Phantom Gaming White with the maker.
It undercut the Sapphire 7900 XT and every other pick on price at the time of writing. The main gap: video memory of 20GB, behind the ASUS TUF RTX 5090 (32GB). If that matters, the ASUS TUF RTX 5090 offers 32GB.
Key dimensions & specs
- GPU: RX 7900 XT
- VRAM: 20GB
- Memory: GDDR6
Pros
- 20GB of VRAM for high-resolution textures
- White shroud and backplate
- 320-bit memory bus
- Undercutting the Sapphire 7900 XT on price when we checked
Cons
- Video memory of 20GB, behind the ASUS TUF RTX 5090 (32GB)
Strong Alternative4 of 4
Sapphire AMD Radeon RX 7900 XT 20GB on Amazon (opens in a new tab)
Sapphire's 7900 XT keeps a USB-C display output alongside two DisplayPort and one HDMI port on a 3-slot cooler.
Best for
- Buyers who want USB-C display output.
Skip if
- Look at the others if this bothers you: its 3-slot cooler covers the slots below.
Why we like it
Its 320-bit memory interface feeds 20GB of VRAM, and it takes three slots. It uses PCIe 4.0 and takes three slots, so check your case clearance. On video memory it ties with the ASRock 7900 XT Phantom Gaming White at 20GB.
Like the ASRock 7900 XTX Phantom Gaming and ASRock 7900 XT Phantom Gaming White, it has GDDR6 memory, while the ASUS TUF RTX 5090 uses GDDR7 memory. The Sapphire 7900 XT occupies 3 slots, but no length is published, so check the maker's spec page against your case. Its power connector and recommended PSU are not published, so confirm both for the Sapphire 7900 XT with the maker. It gives ground on video memory, where the ASUS TUF RTX 5090 offers 32GB.
Key dimensions & specs
- GPU: RX 7900 XT
- VRAM: 20GB
- Memory: GDDR6
- Thickness: 3-slot
- Outputs: 2 x DisplayPort, 1 x HDMI, 1 x USB-C
Pros
- 20GB of VRAM for high-resolution textures
- USB-C display output
- 3-slot reference-style cooler
Cons
- Its 3-slot cooler covers the slots below
- Video memory trails the ASUS TUF RTX 5090 (32GB)
- Costs more than the ASRock 7900 XT Phantom Gaming White at the time of writing
How We Chose
Each pick was assessed across 4 criteria weighted for real-world use.
- What we compared
- We set side by side four cards on GPU, video memory, memory and outputs as the makers state them. We did not test them in-house.
- The shared baseline
- All 4, from the ASUS TUF RTX 5090 to the Sapphire 7900 XT, state GPU, video memory and memory.
- Where the specs have gaps
- The ASRock 7900 XTX Phantom Gaming and the ASRock 7900 XT Phantom Gaming White give no outputs.
- Price range
- At our last check the picks ran from the ASRock 7900 XT Phantom Gaming White ($500 to $1000) to the ASUS TUF RTX 5090 (over $1500).
What to Look for in a GPU for 4K Gaming
Key buying criteria so you get the right fit the first time.
How much video memory you need
Here video memory runs from 20GB on the Sapphire 7900 XT to 32GB on the ASUS TUF RTX 5090. For less, the ASRock 7900 XTX Phantom Gaming is the runner-up at 24GB.
Memory
The ASUS TUF RTX 5090 lists GDDR7; the ASRock 7900 XTX Phantom Gaming, the ASRock 7900 XT Phantom Gaming White and the Sapphire 7900 XT list GDDR6. Rule out the mismatches before looking at price.
Fit and compatibility
No dimensions are published for the ASUS TUF RTX 5090; get length and thickness from the maker's page first. The Sapphire 7900 XT occupies 3 slots, but no length is published, so check the maker's spec page against your case.
Features beyond the spec table
The ASRock 7900 XTX Phantom Gaming: 0dB silent cooling at light load. The ASRock 7900 XT Phantom Gaming White: a 320-bit memory bus. The Sapphire 7900 XT: a 3-slot reference-style cooler.
How much to spend
$500 to $1000 buys the ASRock 7900 XT Phantom Gaming White and the Sapphire 7900 XT; $1000 to $1500 buys the ASRock 7900 XTX Phantom Gaming; over $1500 buys the ASUS TUF RTX 5090 at our last check.
How to Choose a GPU for 4K Gaming
By priority
| Priority | Consider | Why |
|---|---|---|
| Buyers who put video memory first | ASUS TUF RTX 5090 | The largest video memory here (32GB) |
| Buyers who want 96MB of Infinity Cache | ASRock 7900 XTX Phantom Gaming | 96MB of Infinity Cache |
| Spending as little as possible | ASRock 7900 XT Phantom Gaming White | Undercutting the Sapphire 7900 XT on price when we checked |
| Buyers who want USB-C display output | Sapphire 7900 XT | A USB-C display output |
Scroll sideways to see every column.
Key specs side by side
The ASUS TUF RTX 5090 leads on video memory at 32GB, ahead of the ASRock 7900 XTX Phantom Gaming at 24GB. "Not listed" means the maker leaves that figure out.
| Card | GPU | VRAM | Memory | Outputs |
|---|---|---|---|---|
| ASUS TUF RTX 5090 | RTX 5090 | 32GB | GDDR7 | 3 x DisplayPort 2.1b, 2 x HDMI 2.1b |
| ASRock 7900 XTX Phantom Gaming | RX 7900 XTX | 24GB | GDDR6 | Not listed |
| ASRock 7900 XT Phantom Gaming White | RX 7900 XT | 20GB | GDDR6 | Not listed |
| Sapphire 7900 XT | RX 7900 XT | 20GB | GDDR6 | 2 x DisplayPort, 1 x HDMI, 1 x USB-C |
Scroll sideways to see every column.
By price at the time of writing
The ASRock 7900 XT Phantom Gaming White was the lowest-priced pick and the ASUS TUF RTX 5090 the highest when we checked; tiers move with Amazon pricing.
| Price tier | Cards |
|---|---|
| About $500 to $1000 | ASRock 7900 XT Phantom Gaming White, Sapphire 7900 XT |
| About $1000 to $1500 | ASRock 7900 XTX Phantom Gaming |
| Over $1500 | ASUS TUF RTX 5090 |
Frequently Asked Questions
Is the ASUS TUF RTX 5090 ahead of the ASRock 7900 XTX Phantom Gaming on video memory?
The ASUS TUF RTX 5090 leads at 32GB, with the ASRock 7900 XTX Phantom Gaming at 24GB. The Sapphire 7900 XT is at the other end of this group with 20GB.
Is the ASUS TUF RTX 5090 worth paying more than the ASRock 7900 XT Phantom Gaming White?
On paper it adds video memory (32GB against 20GB). The ASRock 7900 XT Phantom Gaming White was the lowest-priced pick when we checked, so pay the difference only if those gains matter to you.
What makes the ASUS TUF RTX 5090 the Largest Video Memory?
It earns the label for the largest video memory here (32GB). It suits anyone who put video memory first.
Do the ASUS TUF RTX 5090 and the ASRock 7900 XTX Phantom Gaming differ on GPU?
The ASUS TUF RTX 5090 uses RTX 5090; the ASRock 7900 XTX Phantom Gaming uses RX 7900 XTX; the ASRock 7900 XT Phantom Gaming White and the Sapphire 7900 XT use RX 7900 XT.
What should I check before buying the ASRock 7900 XTX Phantom Gaming?
No dimensions are published for the ASRock 7900 XTX Phantom Gaming; get length and thickness from the maker's page first. ASRock 7900 XTX Phantom Gaming: the maker suggests a PSU of 800W or more. In this guide it ranks second of 4.
Beyond the specs, what sets the ASUS TUF RTX 5090 and the ASRock 7900 XTX Phantom Gaming apart?
The ASUS TUF RTX 5090: a 512-bit memory bus at 28Gbps. The ASRock 7900 XTX Phantom Gaming: 96MB of Infinity Cache. The ASRock 7900 XT Phantom Gaming White: a white shroud and backplate.
Bottom Line
Our first pick is the ASUS TUF RTX 5090, chosen for the largest video memory here (32GB). Look at the ASRock 7900 XTX Phantom Gaming for 96MB of Infinity Cache, the ASRock 7900 XT Phantom Gaming White for undercutting the Sapphire 7900 XT on price when we checked and the Sapphire 7900 XT for a USB-C display output if those matter more to you.
Check the power connector and PSU wattage first; these cards draw the most power of any part.