Multiplier-unlocked Xeons according to overclocking results from HWBOT:
W5580 (most probably not unlocked, despite of one CPU-Z validation; please see also https://forums.servethehome.com/ind...h-an-open-multiplier.15983/page-5#post-209642)
W5590 (most probably not unlocked)
E5-1620 (source - max CPU multiplier is 43, just like the i7-3820)
E5-1620 v2 (source)
Additional confirmed observations:
- all Xeon E5 v3 with C2 stepping can be clocked all cores to max turbo multiplier (called Xeon turbo core exploit)
Since there don't seem to be a definite source about which Xeons are overclockable by changing their frequency multiplier, I want to create one.
While "common knowledge" of most people seems to be that Xeons don't have an open multiplier, a few guys know it better. For example, my Xeon E5-1680 v2 can be overclocked solely by changing the CPU multiplier.
When googling terms like "xeon overclockable", you will occasionally find statements like "the E5-16xx series Xeons have an open multiplier when there is an equivalent i7" or "all E5-16xx series Xeons are overclockable from the model number of 1650 and upwards" or "this only applies to v1, v2 and v3 Xeons". While all of these statements seems to be correct to a certain point, I got the feeling that noone really knows exactly.
The fact that there are hardly any reviews of these Xeons out there emphasizes the uncertainty.
So please share your knowledge, and if you got sources or screenshots of an multiplier-overclocked Xeon, please post them in this thread. I will edit this first entry and collect the facts in the hope to shed light into Xeon overclocking once and for all.
I will start with my semi-knowledge:
- There are only overclockable Xeons from the E5-1600 series range of processors, the E5-2600 are all locked (quite sure)
- Beginning with the v4 Xeons, they are all locked (someone at the HardOCP forums stated this)
I don't think so, at least I haven't found anyone mentioning that their overclockable Xeons suddenly stopped being overclockable after installing the latest Windows patches or modding their BIOSes to integrate the new microcodes....
and, is there any evidence that Intel is using the Spectre/Meltdown microcode patch to lock these xeons back up?
How can i do that on a HP z400 with windows10 the bios does not provide any settings regarding overclock. Can i do this via software on windows ? XTU and ThrottleStop dont work i tried themThe Xeon X5690 doesn't seem to have an unlocked multiplier, but you can overclock locked Nehalem-based CPUs by changing their reference base clock.