This is not true....not to sound bad to anyone but those manuals are so dated that there prob. the orignal ones from when the XPS 410 was realeased.
Anyways as we know big name companys like Dell are a pain when it comes to updating BIOS's and other hardware because they never tell you why they did it, or what they did.
So to make a long story short I got the recent log update from someone I know at dell through my work. This was even confimed on dell forums by someone else a few days later. Here is every CPU that will work for the XPS 410
PR173 Presler P4 915, 2.80G, 2X2MB, 800FSB, D0
UY273 Presler P4 915, 2.08G, 2X2MB, 800FSB, C1
YW816 Presler P4 925, 3.00G, 2X2MB, 800FSB, D0
XJ848 Presler P4 930, 3.00G, 2X2MB, 800FSB, C1
PU963 Presler PD 935, 3.20G, 2X2MB, 800FSB, D0
DK050 Presler P4 940, 3.20G, 2X2MB, 800FSB, C1
RT922 Presler P4 945, 3.40G, 2X2MB, 800FSB, C1
UJ776 Presler P4 950, 3.40G, 2X2MB, 800FSB, C1
CJ163 Presler P4 960, 3.60G, 2x2MB, 800FSB, B1
DK593 Cedar Mill 631, 3.00G, 2MB, 800FSB, C1
PN407 Cedar Mill 641, 3.20G, 2MB, 800FSB, D0
PY394 Cedar Mill 641, 3.20G, 2MB, 800FSB, C1
KU339 Cedar Mill 651, 3.40G, 2MB, 800FSB, D0
PY395 Cedar Mill 651, 3.40G, 2MB, 800FSB, C1
DK594 Cedar Mill 661, 3.60G, 2MB, 800FSB, C1
DT883 Cedar Mill 661, 3.60G, 2MB, 800FSB, D0
HU587 Conroe E4300, 1.80G, 2MB, 800FSB, L2
DX483 Conroe E4400, 2.00G, 2MB, 800FSB, L2
RX522 Conroe E4400, 2.00G, 2MB, 800FSB, M0
DT893 Conroe E6300, 1.86G, 2MB, 1066FSB, B2
DU362 Conroe E6300, 1.86G, 2MB, 1066FSB, L2
DX485 Conroe E6320, 1.86G, 4MB, 1066FSB, B2
DU361 Conroe E6400, 2.13G, 2MB, 1066FSB, L2
KN977 Conroe E6400, 2.13G, 2MB, 1066FSB, B2
DX484 Conroe E6420, 2.13G, 4MB, 1066FSB, B2
KU345 Conroe E6600, 2.40G, 4MB, 1066FSB, B2
PN416 Conroe E6700, 2.66G, 4MB, 1066FSB, B2
WM543 Conroe XE X6800, 2.93G, 4MB, 1066FSB, B2
FG941 Smithfield P4 820, 2.80G, 2MB, 800FSB, Mainstream, B0
UY272 Smithfield P4 805, 2.66G, 2X1MB, 533FSB, B0
HU585 Kentsfield Quad Core Q6600, 2.40G, 8MB, 1066FSB, B30
MP626 Kentsfield Quad Core Q6600, 2.40G, 8MB, 1066FSB, G0
UT713 Prescott P4 531, 3.0G, 800FSB, 1MB, ALT, G1
UT714 Prescott P4 541, 3.2G, 800FSB, 1MB, ALT, G1
UY274 Prescott P4 524, 3.06G, 1MB, 533FSB, G1