Here are some models I have been able to find info on:
ASUS H81M-PLUS (Micro-ATX): OC to 4.2 GHz
@ 1.24 volts, see post #230.
ASUS H81M-D (Micro-ATX): OC to 4.3 Ghz
at 1.15 volts, see post #171.
ASUS H81M-C (Micro-ATX): OC to 4.6 GHz
at 1.3 volts, see post ---> http://forums.anandtech.com/showpost...&postcount=147
ASUS B85M-E/CSM (Micro-ATX): See post #231.
ASUS B85M-E (Micro-ATX): OC to 3.8 GHz
, see post #159.
ASRock H81M-HDS (Micro ATX): OC to 4.5 Ghz
at 1.3 volts, see post #19.
Asrock H81M-ITX (Mini-ITX): 4.2 Ghz
at 1.2 volts. See post #102.
ASRock H81M-ITX/Wifi (Mini-ITX) : See page 61 of the owners manual published May 2014 for reference to Non-Z overclock: http://download.asrock.com/manual/H81M-ITXWiFi.pdf
ASRock H81 Pro BTC (ATX): 4.5 Ghz
at 1.25 volts, see post #63. 4.7 Ghz
at 1.35 volts, see post #75.
Asrock B85M Pro4 (Micro-ATX): 4.1 GHz
at 1.25v, see post #132.
ASRock Fatal1ty B85 Killer (ATX) : Several Newegg reviewers claim Non-Z overclocking was working back in March 2014. Also see forum review from January 2014 in post #38
ASRock H97M Pro4 (Micro-ATX) : See page 70 page of the following owners manual published April 2014 under "4.3 OC Tweaker Screen" for Non-Z overclock--> ftp://220.127.116.11/manual/H97M%20Pro4.pdf
ASRock Fatal1ty H97 Performance (ATX) :See review dated June 30th, 2014--> http://www.pcgameware.co.uk/reviews/...rboard-review/
BIOSTAR H81MHV3 (Micro-ATX): 4.3 GHz
@ 1.2 volts, see post #153.
Gigabyte GA-H81M-DS2V (Micro-ATX): OC to 4.39 GHz.
See post #26. (Voltage limited to 1.2v by Gigabyte)
Gigabyte GA-H81M-H (Micro-ATX): OC to 4.3 GHz
. See post #65 and #112. (Voltage limited to 1.2v by Gigabyte)
Gigabyte GA-H81-D3 (ATX): 4.0 GHz
at 1.115 volts, see post #85.
Gigabyte GA-B85N Phoenix-WIFI (Mini-ITX) :Non-Z overclock found in owner's manual, see post #39.
Gigabyte GA-B85M-DS3H (Micro-ATX) : Reported to Non-Z OC Pentium 3258 to 4.3 Ghz
, see post #31 and 4.0 Ghz
post #14) (Voltage limited to 1.2v by Gigabyte)
Gigabyte H97N-WIFI (Mini-ITX): See post #136, 4.1 GHz
Gigabyte GA-H97M-HD3 (Micro-ATX): See post #46
MSI H81M-E33 (Micri-ATX): [b]4.3 GHz[b], See this review---> http://www.jagatreview.com/2014/08/h...si-h81m-e33/5/
MSI H81M-P33 (Micro-ATX): 4.5 Ghz
at 1.3 volts, but compared against other processors at 4.4 Ghz
at 1.275 volts ---> http://www.tomshardware.com/reviews/...king,3888.html
MSI B85i ITX (Mini-ITX): 4.6 Ghz
at 1.21 volts, see post #221
MSI B85M Gaming (Micro-ATX): Newegg reviewer on 7/31/2014 reports being able to overclock Pentium G3258 with newest BIOS. Also see post #133 with the following result: 4.0GHz at 1.075v
MSI B85-G43 gaming (ATX) :See post #16, OC was 4.5 Ghz
. There is also a video from 2013 in post #6. Glad to see Non-Z overclocking still working on that board in 2014)
Any more motherboard models that could be used for "Non-Z overclocking" Pentium 3258?
P.S. Please note more than one person has had difficulty changing the multiplier on MSI boards from Auto to a multiplier higher than 32 due to the counter-intuitive method used in the BIOS. If you think you cannot change your multiplier on your MSI Non-Z board please read this post ---> [url]http://forums.anandtech.com/showpost.php?p=36561735&postcount=114 .