The ASUS ROG Astral LC GeForce RTX 5090 is the liquid-cooled, top-of-the-stack version of ASUS's flagship Astral line, built on NVIDIA's full GB202 Blackwell die with 21,760 CUDA cores and 32GB of GDDR7 on a 512-bit bus. The 'LC' means it ships as a hybrid card: a slim 2.5-slot board carrying the GPU and VRAM mated to a sealed 360mm all-in-one radiator with three fans, so the bulk of the 600W heat load is exhausted directly out of your case instead of dumped into it.
This specific model — the O32G OC Edition — is factory overclocked to a 2,467 MHz boost in OC mode (2,437 MHz default), modestly above NVIDIA's 2,407 MHz reference, and runs the full 600W power limit. ASUS keeps the signature Astral extras: a GPU Guard alloy frame, a customizable OLED/ARGB display on the card, and a quad-fan-equivalent thermal philosophy now handled by the AIO. It's aimed squarely at people who already decided they want a 5090 and now want the best-cooled, quietest, highest-clocking one available.
In short, this is a no-compromise halo product. If you're building a flagship 4K/8K gaming or heavy AI/creator workstation and case airflow or noise is a concern, the LC is the Astral to get — provided you can stomach the price and find room for the radiator.
Quick verdict: The ROG Astral LC RTX 5090 is, measurably, the best RTX 5090 you can buy: a 360mm AIO keeps the core in the mid-60s°C and VRAM in the mid-70s°C while staying quieter than the Founders Edition, the factory 2,467 MHz OC and the full 600W limit make it one of the coolest, quietest 5090s, and it does it in a tidy 2.5-slot board. The only real knock is the ~$2,899 sticker — a brutal premium even by 5090 standards.
ASUS ROG Astral LC GeForce RTX 5090 — Full Specifications
| Specification | Detail |
|---|---|
| GPU & Architecture | |
| GPU | NVIDIA GeForce RTX 5090 (Blackwell) |
| GPU Chip | GB202-300 |
| Process Node | TSMC 4NP |
| Die Size | 750 mm² |
| Transistors | 92.2 billion |
| CUDA Cores | 21,760 |
| Streaming Multiprocessors | 170 SMs |
| RT Cores | 170 (4th Gen) |
| Tensor Cores | 680 (5th Gen) |
| ROPs | 176 |
| TMUs | 680 |
| AI Performance | 3,352 AI TOPS |
| Memory | |
| Capacity | 32GB GDDR7 |
| Memory Speed | 28 Gbps |
| Bus Width | 512-bit |
| Bandwidth | ~1,792 GB/s |
| Clocks & Performance | |
| Boost Clock (OC Mode) | 2,467 MHz |
| Boost Clock (Default Mode) | 2,437 MHz |
| Reference Boost (NVIDIA) | 2,407 MHz |
| FP32 Compute (OC) | ~113.6 TFLOPS |
| Pixel Fill Rate | ~459.4 GPixel/s |
| Texture Fill Rate | ~1,775 GTexel/s |
| Cooling & Power | |
| Cooler Type | 360mm hybrid AIO liquid cooler |
| Radiator | 400 x 120 x 65 mm (extra-thick 38mm core) |
| Radiator Fans | 3 x high-static-pressure fans |
| Total Graphics Power (TGP) | 600W |
| Power Connector | 1 x 16-pin (12V-2x6 / 600W) |
| Recommended PSU | 1000W |
| VRM Cooling | Onboard fan + heatsink for board components |
| Display & I/O | |
| PCI Express | PCIe 5.0 x16 |
| HDMI | 2 x HDMI 2.1b |
| DisplayPort | 3 x DisplayPort 2.1b |
| Max Simultaneous Displays | 4 |
| Max Digital Resolution | 7680 x 4320 (8K) |
| Dimensions & Build | |
| Card Dimensions | 288.46 x 153.7 x 48 mm |
| Slot Width | 2.5 slots |
| Lighting | ARGB + onboard OLED display |
| Structural Frame | GPU Guard alloy backplate/frame |
| Warranty | 3-year limited (US) |
How the Astral LC GeForce RTX 5090 compares
How the liquid-cooled Astral stacks up against NVIDIA's reference card and ASUS's own air-cooled Astral OC.
| Specification | ROG Astral LC RTX 5090 | NVIDIA RTX 5090 Founders Edition | ROG Astral RTX 5090 OC (air) |
|---|---|---|---|
| Cooler | 360mm AIO liquid | Dual-slot dual-flow-through air | 3.8-slot quad-fan air |
| Boost Clock | 2,467 MHz (OC) | 2,407 MHz | 2,467 MHz (OC) |
| Power Limit (TGP) | 600W | 575W | 600W |
| Slot Width | 2.5 slots (card) | 2 slots | 3.8 slots |
| Memory | 32GB GDDR7 512-bit | 32GB GDDR7 512-bit | 32GB GDDR7 512-bit |
| Gaming GPU Temp | ~67°C | ~77°C | ~60°C |
| VRAM Temp | ~76°C | ~84°C+ | ~80°C |
| Noise (out of box) | ~39.3 dBA | ~40.1 dBA | ~36 dBA |
| Outputs | 3x DP 2.1b, 2x HDMI 2.1b | 3x DP 2.1b, 1x HDMI 2.1b | 3x DP 2.1b, 2x HDMI 2.1b |
| OLED Display | Yes | No | Yes |
| US Price | ~$2,899 | $1,999 | $2,799 |
Performance & Thermals
Gaming & Compute
As the highest-clocked stock 5090 (2,467 MHz OC) running the full 600W limit, the Astral LC lands right around the Founders Edition out of the box — its pricier LC OC Edition sibling is the chart-topper, while this standard SKU wins on cooling and noise. In practice that means uncompromised native 4K and DLSS 4-assisted 8K gaming, plus excellent throughput for AI/LLM and creator workloads thanks to the full 32GB GDDR7 framebuffer and ~1,792 GB/s of bandwidth.
Thermals
This is the card's headline strength. With the 360mm AIO handling the 600W load, measured gaming temps land around 67°C on the core and ~76°C on the VRAM hotspot — roughly 10°C cooler on the core than the Founders Edition and well clear of throttling. Power-limited stress at 600W still keeps the core near 72°C.
Acoustics
Despite the larger cooling system, the LC measured ~39.3 dBA out of the box — actually quieter than the dual-slot Founders Edition (~40.1 dBA). A quiet BIOS keeps radiator fans near ~1,300 RPM. It is not silent under load, but it is excellent for a 600W card.
Power
TGP is locked at 600W via the single 16-pin connector; ASUS recommends a 1000W PSU. Gaming draw sits at the 600W ceiling under demanding 4K ray-traced titles, so a quality ATX 3.x supply with a native 12V-2x6 cable is strongly advised.
Overclocking Headroom
On top of the factory OC, reviewers gained roughly +5% real-world performance with manual tuning; the liquid cooler's thermal margin helps sustain boost. Memory overclocking is capped by NVIDIA at +375 MHz on the GDDR7, which is the main ceiling on extra performance.
Pros and Cons
✅ Pros
- Fastest stock RTX 5090: 2,467 MHz factory OC at the full 600W limit
- 360mm AIO delivers class-leading thermals (~67°C core, ~76°C VRAM in gaming)
- Quieter out of the box (~39.3 dBA) than the Founders Edition
- Slim 2.5-slot card frees up case space versus 4-slot air monsters
- Full 32GB GDDR7 / 512-bit bus for 8K gaming, AI and creator workloads
- Premium extras: onboard OLED display, ARGB, GPU Guard alloy frame, dual HDMI 2.1b
- 3-year US warranty
❌ Cons
- ~$2,899 MSRP is a brutal premium over the $1,999 5090 baseline
- Requires room and a mount point for a 360mm radiator plus fans
- 600W power draw needs a strong 1000W ATX 3.x PSU and native 12V-2x6 cable
- AIO adds a long-term pump/liquid failure point versus a pure air cooler
- Memory OC capped at +375 MHz by NVIDIA limits extra headroom
- Overkill for anyone not gaming/working at 4K and above
Who should buy the Astral LC GeForce RTX 5090?
Buy the Astral LC if you've already committed to an RTX 5090 and want the best-cooled, quietest, highest-clocking one — ideal for 4K/8K gaming rigs or AI/creator workstations where noise and a slim slot footprint matter and you have room for a 360mm radiator. If you can't mount an AIO, prefer a pure air cooler's simplicity, or want to save several hundred dollars, the air-cooled Astral OC or a cheaper AIB 5090 makes more sense. And if you game at 1440p or below, a 5090 of any kind is more card than you need.
Frequently Asked Questions
How much does the ASUS ROG Astral LC RTX 5090 cost?
ASUS set the official launch MSRP at ~$2,899.99 for the LC OC Edition — about a 55% premium over NVIDIA's $1,999 RTX 5090 baseline. Because of limited 5090 supply, street prices have often run at or above MSRP, so expect to pay full sticker or more.
Is the liquid-cooled Astral worth it over the air-cooled version?
If thermals, noise and a slim 2.5-slot footprint matter, yes. The LC runs roughly 10°C cooler on the core than the Founders Edition and is quieter out of the box, while the air-cooled Astral OC matches its clocks but needs a 3.8-slot bay. The LC's tradeoffs are the higher price and needing space to mount a 360mm radiator.
What PSU and case do I need for the Astral LC?
ASUS recommends a 1000W power supply, ideally a quality ATX 3.x unit with a native 12V-2x6 (16-pin) cable, since the card pulls up to its 600W TGP. Your case needs a 360mm radiator mount (front or top) with clearance for the 400 x 120 x 65 mm radiator and three fans, plus room for the 2.5-slot card itself.
How hot and loud does it get?
In 4K ray-traced gaming at the full 600W load, it runs around 67°C on the GPU core and about 76°C on the VRAM hotspot — well clear of throttling. Noise measured around 39.3 dBA out of the box, slightly quieter than NVIDIA's Founders Edition, making it one of the coolest and quietest 5090s available.
How much faster is it than the RTX 5090 Founders Edition?
It pairs a 2,467 MHz factory boost (vs 2,407 MHz reference) with the full 600W limit, though its raw gaming lead over the Founders Edition is minimal. The bigger wins are far lower temperatures, slightly lower noise and more sustained boost under load.
Does it have good overclocking headroom?
Yes. On top of the factory OC, reviewers gained roughly +5% real-world performance with manual tuning, helped by the AIO's thermal margin. The main limit is GDDR7 memory, which NVIDIA caps at +375 MHz across all 5090s, so most extra gains come from the core and power tuning.
