I am an experienced OC'er with a loooong history dating back to S775 days, so I immediately shut the system down, unplugged it, and cleared the CMOS. I pressed the "4 way optimization", the AI Suite ran the tests etc, rebooted, it changed settings on the AI SUITE and set all my cores to 42X.ĭo you know what happened? My CPU stayed permanently at 800 MHz. I tried overclocking using the ASUS AI SUITE. My i7-4770k always stays at 3.5 GHz (stock) even when I am running Prime 95.Ģ. The CPU auto-adjusts its own voltage depending on the clock speed, but our attempts to reduce the amount of voltage manually (and thereby recover overclocking headroom) failed - Intel’s own mechanism for determining voltage appears to be extremely close to the actual minimal amount.īoth cores take a sharp turn upwards as we scale them - the 4770K starts scaling poorly at 4GHz, while the 4790K turns upwards above 4.4GHz.1. Unfortunately, 18 degrees cooler only translates into a single speed grade - at 4.6GHz, we hit the same 100C / 125W limit. #HOW TO ENABLE TURBO BOOST I7 4770K FULL#The gap increases at every point - by the time we hit 4.4GHz, the Core i7-4790K is a full 18 degrees cooler than its predecessor (82C vs. It’s visible even at 3.5GHz, where the Core i7-4790K is 9 full degrees cooler than the Core i7-4770K. Both chips maintained their standard cache clocks of 3.9GHz and 4GHz respectively. In order to build a fair representation of the two cores’ performance, we started both cores at 3.5GHz, which is the Core i7-4770K’s stock speed, then moved forward from there, measuring total system power consumption and temperatures at every point. Prime95 was looped for 20 minutes for every test in its “Maximum Heat, Power Consumption” setting. Temperatures were taken using Core Temp RC8, and confirmed with Asus’ AISuite III utility. We benchmarked both cores using Prime95 to load them for extended periods of time. In our tests, we locked all four cores at the same frequency - at 4.4GHz, our Core i7-4790K is technically overclocked by 4.7% (at least, compared to how Intel normally implements Turbo Mode). The Core i7-4770K therefore runs Prime95 at 3.7GHz on all four cores, while the Core i7-4790K runs at 4.2GHz. Haswell changed this - the Turbo Mode frequency for all four cores is now typically 200MHz below the maximum speed. In the past, Intel quad-cores would often hit full Turbo frequency on all four cores, even under full load. One thing to be aware of is that Haswell’s Turbo mode operates somewhat differently than other Intel chips. Using the Voltair means that our power consumption figures for the CPU are about 50W higher than they’d otherwise be - so keep that in mind when checking our results. It’s also absolutely massive and weighs well over three pounds - so much, in fact, that we test it in a tower lying on its side (I’m not gutsy enough to try lifting the thing given that Intel specifies a maximum heat sink weight of about 1.5 pound when this weights twice that). The Voltair is unique among air coolers in that it incorporates a Peltier cold plate directly into the heat sink design. When the Core i7-4770K launched it appeared to confirm that trend, but does Devil’s Canyon herald a return to the good old days of scaling? To find out, we outfitted both cores with the largest air-cooler we’ve ever tested - the V3 Voltair. Two years ago, we predicted that the overclocking business was headed for a slow death as future CPU cores would have less and less headroom. This site may earn affiliate commissions from the links on this page.
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