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The card's own specification settles most of the build for you. Twelve gigabytes of GDDR7 across a 192-bit bus delivers around 670GB/s, which is generous at 1440p and the reason this tier holds high textures where narrower eight-gigabyte parts begin to hitch. The 250W board power figure is the other half of that story: NVIDIA's guidance is a 650W system supply, partner cards take either a single eight-pin lead or the 12V-2x6 connector, and the complete machine under load sits nearer 400W than the 700W a top-tier build asks for.
What remains to be decided is where the frames actually come from. At 1440p and above the graphics card is the limiting component in nearly every title, so a current six-core chip is sufficient and an eight-core one earns its place only if you stream or edit alongside. Memory belongs in two sticks rather than one, storage should be something you can add to rather than replace, and the panel in front of it all has to be able to show what the card produces.