Bit Tech reports PC makers are surprised by the high heat output of the retail Haswell processors. The site's sources claim the retail samples run significantly hotter and with lower overclocking potential than the pre-launch engineering samples:
According to PC Pro, manufacturers who produce pre-overclocked gaming systems have found that the retail chips they've just received are only hitting speeds of 4.2GHz to 4.4GHz stably compared to up to 4.8GHz with pre-production engineering samples.
One manufacturer claims that pre-release chips marked as 3.5GHz parts were tested completely stably at 4.8GHz, but of the 40-50 retail units the company has tested not a single one has managed to reach above 4.2GHz without hitting unsafe temperatures or requiring too-high levels of voltage. Another firm has stated that it has had to drop plans to offer pre-overclocked Haswell systems running at 4.5GHz - a figure, again, planned based on engineering work carried out on pre-production samples provided by Intel - to 4.3GHz in order to ensure stability. 'There is a big difference in the overclocking potential between early Haswell samples and retail,' the unnamed manufacturer claimed.
Another manufacturer claims that retail Haswell parts are proving too hot to handle, stating that even while running at stock speeds the chips reach higher temperatures than the pre-production engineering samples - by around 15 degrees Celsius, according to the unnamed company's tests - or even the retail models of Intel's last-generation Ivy Bridge chips.