Choose between the I7 4790K and I7 5775C based on your needs.
Choose between the I7 4790K and I7 5775C based on your needs.
You're considering upgrading your CPU in a Clevo P750ZM (DTR laptop). The 5775C offers a lower TDP of 65W compared to the 4790K's 88W. At stock performance, both will work, but the 5775C may offer better efficiency and cooler operation. If you're starting with an i7-4790, the upgrade could be beneficial depending on your workload.
Be mindful of the laptop's cooling design. Swapping CPUs or increasing power beyond its intended limits can cause overheating. Determine the current CPU's wattage and confirm whether it appears on the officially approved list. Many suppliers may approve upgrades, but missing from the list can prevent the system from starting.
It works well with the i7 4790k and can be boosted to 4.4ghz in terms of DPDT. The design focused on overclocking, so I feel confident about that aspect.
The 5775C offers solid performance across all cores with a base speed of 3.6, while the newer models like the 4790K provide higher boosts at 3.8 and 4.2 all-core speeds. The 5775C slightly edges out in IPC but trades off with lower clock rates; it’s not considered a top overclocking choice based on my observations. My similar setup uses a Crystalwell 4950HQ with a 128MB L4 cache, which runs efficiently for media playback, web browsing, and light gaming—especially when boosted to 3.8 all-core and 4.2 single core. If pushed with tools like Prime95 or Cinebench, it stays under 85W and generates minimal heat. For the 4790K, expect around 80–85W max even at full load, reaching about 80°C eventually. Cooling becomes crucial: ensure your case has adequate airflow and a quiet fan to manage both the CPU and GPU. If you’re looking for mobile options, the 1150 socket CPUs are limited, but you can find deals on eBay—just note that 4th-gen chips are now scarce and prices are steep.
It's possible to run the i7 4790 at 3.8 GHz across all cores without throttling, and the stress test shows stable performance around 70-75°C when everything is operating at full capacity.
How much power is being used? At 75°C you have roughly 20°C buffer before it begins to slow down around 90-95°C. That’s not a huge thermal load, you might see a bit more speed without throttling the 4790K, but I’m not sure it’s worth the investment. What graphics card are you using? That could be a better upgrade option. Are there any issues you’ve noticed with the performance of the 4790?
The 5th generation CPUs had a brief existence (often just months) since the 6th Gen models followed quickly. It was essentially Intel exploring the potential of its Iris Pro graphics, marking the first time they were used. The i7-5775C launched around June 2015, while the i7-6700K came out in August 2015. Its TDP is lower due to the Broadwell architecture compared to the older Devil's Canyon design. However, it also features significantly reduced base and boost speeds when contrasted with the i7-4790K. For a detailed comparison, see the review at the provided link. Stick with the i7-4790K unless you plan to leverage Iris Pro capabilities.
Seems AIDA64 is claiming 32 watts, though I doubt that since it's running smoothly at 3.8GHz with all cores active and the system stays at 100W on the GTX 970 M (100W TDP). They just got a P4000 mobile a few days back, which also has a 100W rating.
32W might not be right; look up the total power in hwinfo. That shows the combined usage of the CPU, uncore, and other components during an AVX load test like prime95. You could also try a tool called powermax from cpu-z, which can stress both CPU and GPU simultaneously for a set duration and provides detailed monitoring.