ASUS ROG Astral LC GeForce RTX 5090

The ASUS ROG Astral LC GeForce RTX 5090 (model ROG-ASTRAL-LC-RTX5090-32G-GAMING) is the standard, non-OC liquid-cooled member of ASUS's flagship Astral family. It uses NVIDIA's full GB202 Blackwell die — 21,760 CUDA cores, 32GB of GDDR7 on a 512-bit bus — on a slim 2.5-slot board bonded to a sealed 360mm all-in-one cooler, so nearly all of the 600W heat load leaves your case through the radiator rather than soaking into it.

This is the model people usually mean when they search "ROG Astral LC RTX 5090", and it is easy to confuse with its pricier sibling. Per ASUS's own specification page, this base 32G card boosts to 2,437 MHz in Default Mode and 2,467 MHz in OC Mode. The Astral LC OC Edition (O32G) is the one that runs 2,580 / 2,610 MHz. Same cooler, same 600W ceiling, same board — different bin and a meaningfully higher price.

Quick verdict: If you have already decided on an RTX 5090 and can mount a 360mm radiator, the base Astral LC is the sensible way into ASUS's liquid-cooled flagship. The AIO is the strongest 5090 cooler TechPowerUp has measured — 58°C at the full 600W, and 30 dBA on the quiet BIOS — and you keep the 2.5-slot footprint, dual HDMI 2.1b and GPU Guard frame while skipping the OC Edition's premium for roughly 6% more factory clock. The catches are the price, radiator clearance and finding one in stock.

ASUS ROG Astral LC RTX 5090 (32G) full specifications

Every figure below is taken from ASUS's official spec sheet for the ROG-ASTRAL-LC-RTX5090-32G-GAMING and NVIDIA's GB202 reference data. Note the clocks: this is the non-OC SKU.

ASUS ROG Astral LC RTX 5090 price and availability in 2026

Pricing on this card is genuinely messy, so here is what is actually documented rather than guessed.

• NVIDIA reference MSRP (RTX 5090): $1,999. Every Astral figure below is a premium on top of that.
• ASUS launch pricing: when ASUS published its US price list, the range-topping ROG Astral LC OC Edition was set at $3,099.99 and the air-cooled ROG Astral OC at $2,799.99, per Tom's Hardware. ASUS did not publish a separate US launch price for this non-OC LC (32G) SKU — it is a lower-volume variant that sits below the OC Edition, and in most regions it lands a little under that $3,099.99 figure.
• Street pricing in 2026: far above launch numbers. Liquid-cooled Astral 5090s have been sitting on Micro Center shelves at $3,719, a price point widely reported as buyer resistance, while ASUS's own eShop has listed the LC OC Edition as high as $4,529.99 in mid-2026.
• Stock reality: the base 32G LC is the harder of the two to find. Newegg carries the exact SKU but has shown it out of stock; most listings you will encounter are the O32G OC Edition or marketplace resellers.

What to do about it: treat anything at or under roughly $3,100 for the non-OC LC as a good price, $3,700 as the current shelf reality, and anything past $4,000 as OC-Edition-or-scalper territory. Because the two SKUs share a cooler and a 600W ceiling, if the OC Edition is only $100–$150 more at the moment you are shopping, take the OC Edition; if the gap is $400+, the base card is the better value.

Astral LC vs Astral LC OC Edition: what the extra money buys

This is the single most useful comparison for anyone on this page, because the two cards look identical in photos and differ only in silicon bin and firmware.

Is the OC Edition worth it? On paper the OC Edition carries roughly a 5.8% higher boost clock. In practice the gap shrinks: both cards hit the same 600W wall, and once a 5090 is power-limited — which it is in any heavy 4K ray-traced scene — the extra rated clock cannot be sustained. Expect low single-digit frame-rate differences, not a tier change. Buy the OC Edition when the price gap is small or when you want the highest guaranteed bin for manual tuning; buy this base LC when you want the same cooler and the same 32GB framebuffer for meaningfully less money. Full numbers for the faster card are in our Astral LC OC Edition review.

Measured thermals, acoustics and the dual-BIOS switch

The cooler is shared across both LC SKUs, so review data collected on the OC Edition sample applies directly here — if anything, the lower-clocked base card should sit fractionally cooler at the same power limit.

TechPowerUp's Astral LC testing recorded 58°C on the GPU core at the full 600W load, the best result of every RTX 5090 it has tested, and described the Astral LC cooler as the most powerful solution in the entire 5090 field. Out of the box the card measured 36 dBA. Flip the physical BIOS switch to the quiet profile and noise drops to 30 dBA — second-quietest 5090 tested — while temperature rises only to 64°C. That is an unusually cheap trade: 6°C for 6 dBA, which is roughly a halving of perceived loudness.

For context, an air-cooled RTX 5090 shedding 575–600W typically lives in the mid-to-high 70s°C and dumps all of that heat back into the chassis, warming your CPU cooler and drives along with it. The AIO's real-world benefit is as much about the rest of the build as the GPU itself.

Power behaviour and headroom

TGP is fixed at 600W through the single 12V-2x6 connector, and that ceiling — not temperature — is the limiter. Notebookcheck demonstrated the point by shunt-modding an Astral LC to around 800W, at which point the liquid cooler still coped and performance climbed past stock. That is a warranty-voiding experiment, not a recommendation, but it shows how much thermal margin the 360mm AIO holds in reserve. Within normal limits, expect roughly +5% from manual tuning; GDDR7 memory overclocking is capped by NVIDIA at +375 MHz on every RTX 5090.

Gaming and creator performance you should actually expect

Do not buy this card expecting a performance tier above other 5090s. At 2,467 MHz OC Mode it is a 2.5% clock bump over NVIDIA's 2,407 MHz reference, and reviewers measuring factory-overclocked Astral cards against the Founders Edition have found single-digit gains — around 8% in the best-case, clock-limited titles for the much higher-clocked OC bins, and considerably less for a card clocked like this one.

• 4K raster: comfortably the fastest consumer tier available; roughly 40% ahead of an RTX 4090 in 4K rasterisation, matching other stock 5090s within margin of error.
• Ray tracing and DLSS 4: 170 4th-gen RT cores and 680 5th-gen Tensor cores, with DLSS 4 Multi Frame Generation up to 4x. This is the card that makes maxed 4K path tracing playable without compromise.
• 8K and high-refresh: two HDMI 2.1b plus three DisplayPort 2.1b outputs and 8K support give it more display flexibility than the Founders Edition's single HDMI.
• AI and creator work: the full 32GB GDDR7 framebuffer at 1,792 GB/s is the real differentiator for local LLM inference, large-scene 3D and 8K video timelines. The AIO matters more here than in gaming, because these loads sit at 600W for hours rather than minutes.

The honest framing: you are paying for cooling, acoustics, build quality and case footprint. The frames are the same frames every 5090 delivers.

Radiator mounting, case compatibility and PSU requirements

More Astral LC buyers get caught out by physical fit than by anything else. Check all four of these before ordering.

1. Radiator clearance: the radiator is 400 x 120 x 65 mm. That 400mm length is longer than a plain 360mm rad, and the 38mm-thick core plus fans needs roughly 65mm of depth. Cases rated for a "360mm AIO" do not automatically clear it — check the listed maximum radiator length and thickness, not just the fan size.
2. Mount location: top-mounting is usually cleanest and exhausts heat straight out. Front-mounting works but pushes 600W of warm air over your motherboard and often conflicts with tall RAM or a front-panel drive cage. If your case already has a CPU AIO up top, you need a second 360mm position — this is the most common blocker.
3. Tubing reach: the tubes run from a PCIe-slot card to the radiator, so a bottom-mounted or inverted-motherboard layout can leave you short. Dry-fit before screwing anything down.
4. The card itself: 288.46mm long and 2.5 slots — genuinely modest by 5090 standards, and far easier to house than the 3.8-slot air Astral. That slot saving is a real benefit if you run a capture card or a second expansion card.

Power supply: ASUS specifies a 1000W minimum. Use a quality ATX 3.x / PCIe 5.1 unit with a native 12V-2x6 cable rather than an adapter octopus, seat the connector until it clicks, and avoid tight bends within ~35mm of the plug. ASUS's Power Detector+ monitors each pin individually and will warn you about an unbalanced connection — a feature worth having on a 600W card. If you also run a 250W+ CPU, step up to 1200W.

How it compares to other flagship RTX 5090 cards

Read across the row and the positioning is clear. The Founders Edition is the value pick and the only one at MSRP. The MSI Lightning Z is the extremist option — a 1,000W-capable board with a 1,600W PSU demand and a lottery to buy it. The air Astral matches the LC OC's clocks but eats 3.8 slots. This base Astral LC is the balanced liquid-cooled entry: the field's strongest 5090 cooler and the smallest in-case card footprint, without paying the OC Edition or Lightning premium.

Pros, cons and who this card is for

✅ Pros

• Strongest RTX 5090 cooler tested: 58°C at the full 600W load
• Quiet BIOS drops noise to 30 dBA for only ~6°C, one of the best trades in the segment
• Compact 2.5-slot, 288mm card frees case space versus 3.8-slot air 5090s
• Heat is exhausted out of the chassis instead of into your CPU cooler and drives
• Full 32GB GDDR7 at 1,792 GB/s for 8K gaming, local AI and creator workloads
• Power Detector+ per-pin 12V-2x6 monitoring, GPU Guard alloy frame, dual BIOS
• Five outputs including two HDMI 2.1b; 3-year US warranty
• Cheaper than the LC OC Edition for the same cooler, board and framebuffer

❌ Cons

• Still a heavy premium over the $1,999 reference RTX 5090
• Lowest clocks of any Astral 5090 — only +2.5% over reference boost
• Needs clearance for a 400mm-long, 38mm-thick radiator plus fans
• Harder to find in stock than the OC Edition
• 600W draw requires a 1000W ATX 3.x PSU and a native 12V-2x6 cable
• The pump is a long-term failure point an air cooler does not have
• Memory OC capped at +375 MHz by NVIDIA across all 5090s

Buy it if you want the coolest, quietest RTX 5090 platform at the lowest entry point in the LC line, you have a confirmed 360mm radiator mount, and you value low noise and a slim card over the last few percent of clock speed — typical of 4K gaming rigs and AI or creator workstations that sit at 600W for hours.

Skip it if your case cannot take the radiator (get the air-cooled Astral OC), you want the highest factory bin and the price gap is small (get the LC OC Edition), you want maximum extreme-OC headroom (look at the MSI Lightning Z), or you simply want a 5090 for the least money — in which case the Founders Edition at $1,999 delivers the same class of frames.