Vostro 3750 Quad Heatsink P/N

I have just upgraded my Vostro 3750 i3 2350m to an i7 2820qm

once i removed the heatsink i knew there was going to be problems the copper area is the shape of a duel core and not a quad so its never going to be a flush fit
due to the slight height difference between the aluminum and the copper and also it doesnt seem to be able to disipate 45w longterm

when priming core 1/2 are around 79deg core 3/4 are around 72 for the first min
after five mins or so core 1/2 reach 95 and 3/4 86 and promptly get throttled to 1800-2000 mhz

has anyone got a 3750 running a quad core direct from dell if so whats the part number
the sticker can be seen by removing the bottom ram/hd cover on the copper heatpipe

Mine is without a gpu so pref would like to know the p/n of a quad without nvidia gpu
but if pushcomes to shove i would try customizing a heatsink meant with an nvidia gpu

the duel core heatsink looks like below btw

 

You could also contact Dell's parts department, they'll find the part # for you, they pulled the part # for the M6700 heatsink I ordered and I just crosschecked with the part # that was posted on NBR.

 

Tried they could only give me the part number for my laptop

 

This looks like the one

Dell Part C78V7 for the inspiron 17r





Also i could maybe adapt this G8K4H for Vostro 3750 with nvidia gpu
this would provide the best cooling if i could adapt it it by grinding down areas that get in the way on the gpu area

 

Im mainly posting this incase anyone else does this in the future

I have just ordered Dell Part C78V7 and will update when it comes in a week or two (coming from usa)
if it fitted and such

 

Here's Dell Part C78V7 for the inspiron 17r fitted to my Vostro 3750
Its a perfect fit

Old Heatsink Weight 52g new Heatsink Weight 58g

I ran prime 95 8 threads Inplace Max FFT's for just over 20 mins
and the max any core got to was 73 but was usually 68-70

The only problem i have now is when its battery powered the cpu hops between 1600mhz and 1800mhz running prime 95

Core temp indicates 18-25 watts power use

Im not sure if that's by design or due to not having the correct battery for a quad core?

In Contrast when powered by the psu running prime 95 8 threads Max FFT's it runs at 2600mhz constantly
Core Temp Indicates 45 watts power use