HP Omen 45L Review: RTX 5090 Performance, Thermals, and Value Analysis

Delivering stable 4K gaming performance with optimized thermals, immersive creator benchmarks, and future-proof expandability options

Hardware by Nakiro on Jul 17, 2025

Many PC gamers have been asking about this specific gaming desktop. On paper, it seems like an excellent deal, but experience reviewing numerous systems over the past few years is essential to determine if it truly delivers.

We analyzed the gaming and creator benchmarks, design and build quality, internal components, thermals, fan noise, overall ease of use, pricing breakdowns, price-to-performance comparisons, and alternative recommendations for every budget.

HP Omen 45L, Review, RTX 5090, Thermals, Value Analysis, NoobFeed

Design and Internals

At first glance, the case design echoes its predecessor, but the signature cryochamber at the top sets it apart. This open external compartment enhances thermal performance by housing a triple fan radiator that draws cool air from below, pushes it through the radiator, and exhausts heat upward.

Removing the brushed-metal front panel is tool-free, granting quick access to the dust filters. A single press of the internal access button pops off the tempered-glass side panel.

Inside, the liquid cooled CPU block sits dead center, routing heat through tubes into the cryochamber. Adjacent to each other, two 16GB sticks of Kingston Fury Beast RGB DDR5 provide a total of 32GB of memory—ample for gaming and creative tasks.

Beneath the CPU lies a Western Digital Black 1TB SSD, delivering read speeds of approximately 6,800MB/s and write speeds of around 5,200MB/s, typical for top-tier pre-built systems.

The HP-branded GeForce RTX 5090 GPU dominates the lower interior; it’s secured with non-modular front and back brackets that stabilize the massive card, but lengthen removal time and block one of the extra PCI slots. Behind the GPU sits an empty M.2 slot for future high speed storage, although the current GPU installation renders it inaccessible.

On the back of the motherboard are two additional 2.5 inch SSD bays and two 3.5 inch hard drive bays. Power comes from a non modular HP 1200W 80 Plus Gold PSU tucked into the bottom right corner.

Ports

At the top, dedicated headphone and microphone jacks flank four USB-A ports and the power button. Around back, a clear CMOS button sits alongside six more USB-A ports, two USB-C ports (one supporting Thunderbolt and display output), an RJ45 Ethernet jack, line-in, line-out, and microphone ports. The RTX 5090’s outputs include one HDMI and three DisplayPort connectors.

HP Omen 45L, Review, RTX 5090, Thermals, Value Analysis, NoobFeed

Software

The preinstalled Omen Gaming Hub offers performance controls—Balanced, Performance, and Extreme modes—thermal profile adjustments, advanced performance tuning for CPU, GPU, and RAM overclocking outside the BIOS, and an upgraded Omen Light Studio with richer RGB animations.

A new LCD tab lets you customize the CPU block display to show system stats, clocks, GIFs, or video. The HP Omen Setup Utility (BIOS) offers fewer customization options compared to other gaming PCs.

Fan Noise and Thermals

In performance mode, gaming produces just 41.2dB of fan noise—the quietest recorded during intense gameplay. Thermal imaging from the system, from off to full load, shows modest heat buildup on the glass near the GPU, but no hotspots exceed safe limits. Inspecting GPU power connectors after extended gaming revealed no signs of melting or damage, unlike some reports of 150°C connector failures elsewhere.

CPU temperatures across various titles at 1080p remain cool, thanks to the cryochamber, earning the lowest average CPU temperatures among current-gen 5090 systems this year. At 4K, GPU temperatures sit around the average for peer systems, despite the whisper-quiet fans.

HP Omen 45L, Review, RTX 5090, Thermals, Value Analysis, NoobFeed

Performance and Gaming Benchmarks

For Cinebench R23 multi-core rendering, the Intel i9-12900K delivered roughly 39,000 points, slightly below that of other PCs with the same CPU, indicating that HP may be throttling its performance.

V-Ray CPU render scores align closely with those of comparable Alienware systems, while its CUDA GPU rendering performance showcases the raw power of the RTX 5090, albeit marginally trailing a few other 5090 builds. Adobe Premiere PugetBench returned 15,723, again underperforming relative to its peers.

Gaming benchmarks at highest presets yielded underwhelming results at 1080p—something you notice when comparing average and 1% low FPS to other 5090 desktops.

In Cyberpunk 2077 at 1600p Ultra with DLSS 4 Quality, you’ll see around 120 fps in dense city areas. Enabling Ray Tracing Ultra reduces performance to the 90-95 fps range, but with DLSS 4 set to Auto and Frame Gen ×4, averages exceed 150 fps. Spider Man 2 at 1600p Very High with DLSS Quality holds above 140 fps during intense battles.

At 1440p, the combined CPU and GPU limitations result in disappointing frame rates. Only at 4K, where dependence shifts to the GPU, do we see respectable performance; yet, it still falls short of several top-tier pre-built systems tested this year.

Pricing and Price to Performance Comparisons

At the time of review, the system retails for $4,780—the lowest price seen yet for a pre-built RTX 5090 desktop. Despite its attractive price, the Alienware Area 51 remains our top pick in this segment, matching or slightly undercutting HP’s price while outperforming it in benchmarks and offering additional PCIe expansion.

The Skytech Prism 3, featuring a Ryzen 9 9800X3D and RTX 5090, delivers superior 4K gaming performance and leads in price-to-performance, making it an even better choice for pure gaming.

HP Omen 45L, Review, RTX 5090, Thermals, Value Analysis, NoobFeed

Top Likes and Dislikes

Our favorite aspects include the whisper-quiet fans, innovative cryochamber cooling design, and competitive pricing. The major drawback is its subpar gaming performance compared to similarly priced systems.

Recommendations for Every Budget

If $4,780 exceeds your budget or you seek alternatives, consider a system closer to $3,000, such as the Skytech King 95 equipped with the Ryzen 9 9800X3D and RTX 5080, which has proven three times faster in key benchmarks than previous generations.

For those who value warranty and support, a $3,500 setup—such as the Corsair Vengeance A7500 with RTX 5080—offers a two-year warranty and an extended return period. Around $2,000, the AVG PC Whirlwind with Radeon RX 9070 XT stands out for its exceptional price-to-performance ratio.

If you must stay under $1,000, the ABS Cyclone Aqua delivers graphics comparable to current consoles at approximately $900, representing the minimum we recommend for decent settings.

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