Multiplier-unlocked Xeons according to overclocking results from HWBOT:
Bloomfield:
W3570 (source)
W3580 (uncertain)
Gulftown:
W3680
W3690
Gainestown:
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)
Sandy Bridge-EP:
E5-1620 (source - max CPU multiplier is 43, just like the i7-3820)
E5-1650
E5-1660
Ivy Bridge-EP:
E5-1620 v2 (source)
E5-1650 v2
E5-1660 v2
E5-1680 v2
Haswell-EP:
E5-1650 v3
E5-1660 v3
E5-1680 v3
Broadwell-EP:
None
Skylake-W:
W-3175X
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)
Probably not unlocked:
W3565 (source) No, a user reported that it isn't unlocked (source)
Bloomfield:
W3570 (source)
W3580 (uncertain)
Gulftown:
W3680
W3690
Gainestown:
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)
Sandy Bridge-EP:
E5-1620 (source - max CPU multiplier is 43, just like the i7-3820)
E5-1650
E5-1660
Ivy Bridge-EP:
E5-1620 v2 (source)
E5-1650 v2
E5-1660 v2
E5-1680 v2
Haswell-EP:
E5-1650 v3
E5-1660 v3
E5-1680 v3
Broadwell-EP:
None
Skylake-W:
W-3175X
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)
Probably not unlocked:
W3565 (source) No, a user reported that it isn't unlocked (source)
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