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Optiplex 755 Quad-Xeon Bios Mod!
#21
(07-29-2015, 08:58 AM)MAC666 Wrote: Hmm, e3323 (771 with adapter) and x3220 (775) don't work on my 755 USFF...

I read, that the BIOS would support these... But i got "Unsupported CPU. System Halted"...

what can I do? Have the newest BIOS

Hate to bump an old thread, but I know the answer to this one.  The 755 USFF doesn't support quad-core processors, even ones that work with the other form factors (SFF, etc) in the 755 lineup.  This is unlike the 745 which can support quad cores.  This is even with the factory bios.
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#22
SamirD
Post a screenshots third (Mainboard) tab of CPU-Z with supported CPU.
Tell sSpec of your quad-core processor.
Show a photo of the screen with error "Unsupported CPU".
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#23
(05-22-2018, 01:23 PM)DeathBringer Wrote: SamirD
Post a screenshots third (Mainboard) tab of CPU-Z with supported CPU.
Tell sSpec of your quad-core processor.
Show a photo of the screen with error "Unsupported CPU".

I tried this with a q9400 (and later that day installed it in another system so I don't have the sspec right now) as well as a q8300 slgur on the stock latest dell bios (a22 I believe).  Again this is for the 745 USFF, and is actually well documented limitation on the dell forums:
https://www.dell.com/community/Desktops-...-p/5114772
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#24
No screenshots - no help.
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#25
(05-22-2018, 02:39 PM)DeathBringer Wrote: No screenshots - no help.

Oh, I'm not needing any help.  I was just explaining to the last poster why quad-core xeons will never work on the Dell 755 USFF, and wanted to post here for people like myself that ran into this thread when trying to find out why or if there is a bios mod that can get around the limitation.
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#26
How about the fastest dual core xeon? Would this work on a USFF 755?

Edit: I just ordered a Xeon 5130 - Dual Core. Just experimenting.. I'll post if this actually works.

771 to 775 Mod Stickers
https://tinyurl.com/y2kuaxkv - Single

https://tinyurl.com/y2yco4as - Pair
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#27
(08-07-2018, 09:34 AM)Fastvan67 Wrote: How about the fastest dual core xeon? Would this work on a USFF 755?

Edit: I just ordered a Xeon 5130 - Dual Core.  Just experimenting.. I'll post if this actually works.

I plan to test an e8600 in my 755 since the e8500 works.  I would expect a xeon dual core to work too, but am not sure about the 5-series xeons.
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#28
(10-17-2014, 02:10 PM)cerverappz Wrote: You shouldn't need a bios mod for this computer because it contains more microcode than most, but your Q35 chipset does not support 5xxx Series processors.

Does this include the E5420 and X5355?
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#29
(08-13-2018, 02:58 PM)HorseRider Wrote: Does this include the E5420 and X5355?
Yes, Q35 doesn't support both of them.
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#30
(08-13-2018, 03:04 PM)DeathBringer Wrote:
(08-13-2018, 02:58 PM)HorseRider Wrote: Does this include the E5420 and X5355?
Yes, Q35 doesn't support both of them.

I will buy an Optiplex 380 then.
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