![]() There's the Core i9-13950HX processor inside, 64GB of DDR5-4800 CL40 memory, plus plenty of cooling capacity to dissipate over 200W of combined CPU and GPU power.įor this review we'll be comparing performance at 1080p, 1440p and 4K, with an external display used for all configurations. On the laptop side we have the MSI Titan GT77 which has the RTX 4090 Laptop GPU configured to a power limit of 150-175W. In addition to the graphics card, the test system is powered by a Ryzen 9 7950X, 32GB of DDR5-6000 C元0 memory, the MSI MEG X670E Carbon Wi-Fi motherboard, built inside the Corsair 5000D. On the desktop side, we're using a high-end gaming system because that's what the majority of people buying an RTX 4090 graphics card will be using. ![]() And with that, it's time to explore performance. We could maybe, just maybe cut Nvidia some slack if both the laptop and desktop models used the same GPU die, but that is not the case. ![]() Based on this alone there is no way the laptop variant and desktop variant will perform anywhere close to each other, so it's highly misleading to give both GPUs basically the same name. The GPU has a boost clock about 500 MHz lower, and memory speeds drop from 21 to 18 Gbps.Īll things considered, the laptop model is trimmed by about 60% compared to the desktop card across all facets with clock speeds at about 80% of the desktop card's level. And because the laptop GPU is power limited to 150-175W in the best cases, versus a whopping 450W for the desktop card, clock speeds are lower across both the GPU core and memory. The desktop graphics card not only has 50% more VRAM, but 75% more memory bandwidth as well. We get 16GB of GDDR6 memory on a 256-bit bus, versus 24GB of GDDR6X memory on a 384-bit bus on the desktop. The memory subsystem is also a lot smaller on the laptop model. This brings with it a substantial reduction in CUDA core count, dropping from a whopping 16,384 to just 9,728 in the laptop model, along with associated reductions in tensor cores, RT cores and L2 cache. Meanwhile, the laptop model uses AD103, the same die as the RTX 4080, which is 379 sq mm in size with 46 billion transistors. It goes right back to the GPU die itself: the desktop card uses AD102, an impressive 609 sq mm die with 76 billion transistors. Without even benchmarking, it's readily apparent from looking at the spec sheet that the RTX 4090 desktop and laptop parts are vastly different. We did mention the deceiving naming scheme, but in today's review we're going to look at just how significant the margin is between these GPUs - and why you might want to spend your hard earned cash on a desktop instead of a laptop this generation for gaming. Having now fully reviewed the Nvidia RTX 4090 Laptop GPU and taken a comprehensive look at how it fares in the laptop market - it's a powerful but expensive upgrade over the previous fastest GPU, the RTX 3080 Ti Laptop - Nvidia has definitely made some impressive strides in terms of performance per watt with the Ada Lovelace architecture.īut one thing we didn't focus on before was how the two RTX 4090 variants compare: the laptop part and the desktop part.
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