M858N is a P/N for 760MT.  This motherboard supports core 2 quad cpu.

@redxps630 

M859N is a DESKTOP which is the OP not M858N is not U562N MT 

@DELL-Chris M  would have more information. 

So I'm not sure why you post it. If you are going to give advice you should at least know what you are referencing.

I was referencing the DESKTOP not SFF not MT

" optiplex copper heatsink " is the performance heat-sink not the Standard

Heat-sink for ANY model or size.  Standard heat-sink is just a chunk of aluminum HR004 for tower and HR544 for Desktop Neither is COPPER.

STANDARD is NOT copper

So again I'm not getting your reference which is not correct.

Performance Heatsink

I got a handful of optiplex 745 DT heatsink from business PC that ran pentium dual core to core2 cpus.  they all have copper plate.  these are compatible with 760/755 DT.

Desktop heat sink R6852 (copper)

I also got a few heatsink that are aluminum based.  I have not correlated which heatsink for which cpu.

If OP has aluminum heatsink and would like to upgrade to quad cpu, should consider upgrade heatsink to copper.

When someone bought these old optiplex running pentium or c2d from Dell, whether copper or aluminum is included in the standard spec might be related on the cpu spec that came with the PC.   

Thanks for all the information that poured in.  I'm still in the dark about my motherboard 0R230R and if it can handle a quad core. I've been all over this forum and the net looking for information on this board.  Some of the information says it can, some says it can't.  I don't want to drop $50 on the cpu if it's not going to run in the MB I have. I would also have to purchase the copper heat sink and shroud so looking at around $75 total for a possible fame or fail situation.

I just need to know if the "elusive" 0R230R motherboard will run an Intel Q9000 series cpu before dropping the hammer on the parts to upgrade to the quad.  This is a budget build and I don't want to throw good money at a bad or high risk idea.

Sometimes reverse engineering of old pc to try to make it work by purchasing parts you do not have ends up costing more than necessary than starting from original Dell stock. If I were you I would think twice before investing in parts for 760 DT. DT is always a less desirable upgrade option than MT. If your goal is to do light gaming having fun on old optiplex, think of getting an MT which would open up much more possibilities than DT (nonstandard non-upgradable psu, low profile video card only). I think banging heads on wall trying to figure out which Dell P/N is quad vs non quad board is much harder without inside info which Dell rarely discloses.  In my local market a complete working c2d 760DT is priced around 50-60. Would I invest 50-75 on top of such low value hardware to upgrade? I probably would not, but you may have special reason for your 760.  I am just suggesting as one door closes or not sure you want to go there, another door is widely open to consider.

"I have not correlated which heatsink for which CPU."

Dell has which is why the copper performance heat-sink is specified for specific Pentium D and Quad core processors. Those CPU's tend to run a lot hotter and require the copper performance heat-sink.

if you use the aluminum heat-sink the CPU tends to throttle and stall due to overheating as the aluminum heat-sink doesn't get the heat away fast enough.

https://www.dell.com/support/article/en-us/sln306267

PPID

CN-0M859N-13740-927-01A9

CN = China
0M859N = Dell Part number
13740 = Manufacturer Factory (confidential)
927 = Date code (Year, Month, Day)
01A9 = Manufacturer code (confidential)

Year
0 2000/2010/2020
1 2001/2011/2021
2 2002/2012/2022
3 2003/2013/2023
4 2004/2014/2024
5 2005/2015/2025
6 2006/2016/2026
7 2007/2017/2027
8 2008/2018/2028
9 2009/2019/2029

Month

1 January
2 February
3 March
4 April
5 May
6 June
7 July
8 August
9 September
A October
B November
C December

Day

1 1st
2 2nd
3 3rd
4 4th
5 5th
6 6th
7 7th
8 8th
9 9th
A 10th
B 11th
C 12th
D 13th
E 14th
F 15th
G 16th
H 17th
I 18th
J 19th
K 20th
L 21st
M 22nd
N 23rd
O 24th
P 25th
Q 26th
R 27th
S 28th
T 29th
U 30th
V 31st

0R230R is not a model that I have EVER seen listed supporting quads.

End users do not have access to dell engineering technical data.

Dell Optiplex 760 Motherboard M859N may be the model that does but this is speculation not confirmation.

https://www.dell.com/support/article/en-us/sln306267/

What is the PPID number? PPID (Piece Part Identification) numbers are affixed to specific Dell parts as a means to identify and or track individual components. Dell PPID numbers can be utilized to determine the age and the part number of a particular part

Every Dell PPID number contains five separate sets of information for a total of 20-digits.

• Country of Origin (underlined blue in Figure 1)
• Dell Five-Digit Part Number (the first character is a filler number since all Dell part numbers are five digits, underlined green in Figure 1)
• Manufacture Identification
• Date Code (Year, Month, Date) (underlined red in Figure 1)
• Alphanumeric Manufacture Sequence Identification Number

PPID

DELL PPID

pentium dual core Presler vs. Smithfield

64 BIT models are preferred

Presler is the 900 series from 915 to 960

Smithfield is the 800 series

The reason to care is that the 915 and up work fine in Optiplex GX620 up to 960.

Having PRESLER means you can run Dual Core and Windows 10 64 bit because the 900 series supports

LAHF SAHF 64 bit instruction required to run Windows 8.1 and 10 64 bit.

If you have 800 series you can still run windows 8.1 and 10 but ONLY 32 bit versions.

Pentium D 915 is very cheap sometimes as little as $5.  This is the go to CPU for really old models like the GX620 or XPS 400.  Just make sure you update BIOS before changing cpu.

https://www.amazon.com/Intel-915-Processor-Certified-Refurbished/dp/B07DLFM1WN

So what I can tell from this is that 13740 is Foxconn.

927 is 2009  FEB 7th

PPID

CN-0M859N-13740-927-01A9

CN = China
0M859N = Dell Part number
13740 = Manufacturer Factory (Foxconn)
927 = Date code (Year, Month, Day) 2009 FEB 7th
01A9 = Manufacturer code (confidential)

https://www.foxconn.com/en-us/

https://www.dell.com/support/article/en-us/sln306267

The Core 2 brand was introduced on July 27, 2006, comprising the Solo (single-core), Duo (dual-core), Quad (quad-core), and in 2007, the Extreme (dual- or quad-core CPUs for enthusiasts) subbrands.

intel logos

MADE BY FOXCONN

NOTE 13740

@DELL-Chris M 

Can you post the 95W to 130w copper performance heatsink part numbers for the various sizes

MT DT SFF USFF

https://www.dell.com/downloads/ap/products/optix/optix_760_tech_guide.pdf

R230R = Optiplex 760 DT motherboard. Only for Asia/Pacific and Brazil. Use kit W158R.

These are all of the heatsinks shown for Optiplex 760. None of these descriptions mention wattage or copper?

JN738 = Optiplex 760 MT, heatsink with shroud

HR004 = Optiplex 760 MT, heatsink with shroud for Conroe and Celeron CPUs

RW134 = Optiplex 760 DT, heatsink with shroud, 2.0

JY385 = Optiplex 760 DT, heatsink with shroud

There are likely more DP/N that these (RW134, R6852) for optiplex 745/755 DT copper heatsink.  Quite sure they also work for 760/780 DT.  All these BTX motherboard have same engineering of cpu socket layout with heatsink retainer screw holes and shrouds. Same statement can be made for MT and SFF, i.e., 745/55/60/80 copper heatsink/shroud interchangeable within each form factor.  This may also include 360/380.