P4 Engineering Sample Decisions

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Hello all, first post on these forums despite a long history of perusing them.

I've reached an upgrade dilemma. I'm currently running a A7N8X-DLX w/ AXP 2500+@2.2GHz that handles most everything well outside of games (limited by my ancient Geforce 3 ti200) . I've been considering upgrading to another system, but have run into the problem of whether to just upgrade the video card to fulfill my gaming purposes (within the constraints of the now dying AGP standard), or creating a full new system. If I go full system, I'd like to go A64 for the price performance ratio, as well as the advantages of relatively silent cooling.

To make things interesting, while going through a mishmash of parts, I got my hands on a P4 3.06GHz engineering sample with the markings:

Intel Confidential
QRBOES MALAY

I plopped down $150 for a brand new P4C800-E DLX motherboard to use with it, but I'm considering selling the motherboard and chip together in order to get money towards a PCI-E/s939 system.

Would the possible overclocks with this system, (along with the higher power consumption) make it a better choice for building a cheaper performance system as opposed to a full upgrade to a PCI-E/s939 platform? Should I go with a simple video card upgrade as an interim?

Your help is very much appreciated, Thanks.