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Having massive cpu issues with dell optiplex 745


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5 replies to this topic

#1 Jaytaylor20

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Posted 20 May 2016 - 03:14 PM

Ok... Pc engineer here, and I'm stumped!
Cup-z told me the specs for the current cpu
Ordered cpu on Amazon (same chipset and everything... Just upgraded to a 3ghz cup instead of the current 2.something
Installed new CPUs and now getting steady orange power light, fans constantly increasing speed... You know, the usual crap.... Same specs, but half a ghz faster cpu! Put the old couple back in and it works fine!!! Please can someone tell me what I'm missing here???

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#2 Drillingmachine

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Posted 20 May 2016 - 03:28 PM

Current CPU is? Previous CPU was? And what is exactly problem? Does computer even work?



#3 Jaytaylor20

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Posted 20 May 2016 - 03:51 PM

Old cpu was socket lga775 2.3ghz, new CPU is socket lga775 3.00 ghz.... Just get Amber power light

#4 Drillingmachine

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Posted 20 May 2016 - 03:54 PM

More spesific please? There are many versions of LGA775, so do not except that every LGA775 CPU will work on every LGA775 socket.



#5 rqt

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Posted 20 May 2016 - 05:20 PM

OptiPlex 745 only works with P4, Pentium D & earlier Core 2 chips (up to Conroe & Kentsfield I think). For later faster Core 2 type chips you need an OptiPlex 755 or later, & even then you probably would require the latest BIOS update.


Edited by rqt, 20 May 2016 - 05:21 PM.


#6 DavisMcCarn

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Posted 20 May 2016 - 05:32 PM

The key with OptiPlex 745's is that they will not run anything faster than a 1066Mhz front side bus and the fastest CPU you can put in one is the E6700 (Wolfdale) http://www.cpu-world.com/CPUs/Pentium_Dual-Core/Intel-Pentium%20Dual-Core%20E6700%20AT80571PH0882ML%20(BX80571E6700).html
To get that to work, you must also have the latest bios: http://www.dell.com/support/home/us/en/19/Drivers/DriversDetails?driverId=R261239&fileId=2731112870&osCode=WW1&productCode=optiplex-745&languageCode=en&categoryId=BI
I'm afraid you'll have to put the old CPU back in to do the BIOS upgrade; but, then, too, what is the E number of the new CPU? (E6600, E7350, etc.(its printed on the part))
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