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Intel’s new “Sapphire Rapids” Xeon W workstation CPUs are finally coming to retail several months after their paper launch. If you plan on picking one up, you might want to add a new power supply to your cart, as you might need it if you also plan on running a high-end GPU simultaneously. We’ve already covered several overclocking attempts on Intel’s newest workstation silicon, but this time a Chinese tech journalist paired it with an RTX 4090 and found the combo required massive power when overclocking. Previous overclocking attempts didn’t include a power-hungry GPU, so this is uncharted territory.
Chinese tech-tuber Extreme Player is in the spotlight today as he acquired two of Intel’s newest overclockable workstation CPUs and overclocked them on video-sharing site Bilibili. The CPUs were the Intel 56-core W9-3495X and the 24-core W7-2495X, the flagship SKUs for the W9 and W7 lineups. The W9-3495X is a $5,889 CPU with a TDP of 350W, but it can consume 420W when a single core is boosting. The W7-2495X costs $2,199 and has a TDP of 225W, along with a 270W TDP under max boost. Extreme Player paired both CPUs with an Asus Pro WS W790E Sage-SE motherboard, which notably offers two 24-pin ports for running dual power supplies.
This handy chart shows how power increases during each stage of overclocking for both chips.
Credit: Extreme Player
The Player began his run with a mild overlock on both chips to see the power draw. First up was to take the W9-3495X up to 4GHz across all 56-cores. This CPU has a base clock of 1.9GHz, with a single-or-dual-core Turbo of 4.8GHz. At those clocks, the CPU was pulling down 830-850W of power, according to Wccftech. The W7-2495X has a base clock of 2.5GHz and a max turbo of 4.8GHz, but its overclocking run began a bit higher at 4.4GHz across its 24 cores. That resulted in a power draw of 575-600W, more than double the rated TDP. These overclocks result in a performance boost in multi-threaded workloads that ranged from 10 to 40% compared with stock.
Not satisfied with a modest clock tickle, Extreme Player cranked things up and took the 56-core CPU up another 200MHz to a 4.2GHz across all cores. That consumed 922W while running at 99C, presumably on a liquid cooling system. The W7 CPU was ratcheted up to 4.8GHz across all cores and ran at a fiery temp of 104C. However, the real shocker was the total system power: 1,440W for the W9 CPU and 981W for the W7 system.
Though almost 1,500W is a lot, it’s still less than the 1,900W consumed by a previous overclocker who got all 56-cores of the W9-3495X up to 5.5GHz on LN2. Still, for a system to require that much power under load, Extreme Player recommends a 2,000W power supply. These exist but are pretty rare. It seems like it would be easier just to run dual power supplies since the motherboard supports it. It also seems like air cooling won’t be sustainable for the higher-end configs of Intel Xeon W, despite Noctua’s best efforts.
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