Both are powered by the Snapdragon 8 Gen 2. The 150W version tops out at 16GB/512GB, the 240W one has a 24GB/1TB memory configuration.
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Realme GT5 Launching Soon; Expected 6.74-inch 1.5K 144Hz AMOLED display, Snapdragon 8 Gen 2 SoC, up to 24GB RAM
Realme GT5 smartphone launched with 24GB RAM and 240W fast charging support
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realme GT5 unveiled with 150W and 240W versions and up to 24GB RAM - Unbox Diaries