The iQOO 15 Ultra is powered by the Snapdragon 8 Elite Gen 5, which can be cooled when needed by a 17 x 17 mm fan. This is intended to allow the flagship SoC to deliver its full potential even under sustained load. In everyday use, however, this works less well than expected.
In the 3DMark stress tests, the Ultra model does not deliver meaningfully better stability than its sibling model, although it is able to draw on more performance. The average rear surface temperature we measured under load, at more than 47 °C, is also significantly higher than that of the ROG Phone 9 Pro at 44.4 °C, despite the latter not featuring a fan. Active cooling in Vivo’s smartphone is therefore not a game changer.
Aside from that, the iQOO 15 Ultra posts strong benchmark results, and it performs particularly well in GPU tests. In some cases, the Adreno 840 even sets new best marks.
The gaming phone packs a massive 7,400 mAh battery, which can be charged either via USB-C at up to 100 watts or wirelessly at 40 watts. In our Wi-Fi test, the iQOO 15 Ultra lasted for more than 28 hours, despite its 144 Hz display and 1440p resolution.
