okay so i got a AMD x4 640 cpu, and i noticed the fan/heat sink has a silverish sticky stuff where the cpu would be touching it. does it all ready have thermal grease on it? will save me $10 ha ha. this is what i bought.
The "sliverish, sticky stuff" is the thermal grease; so, yes, it already comes with the CPU.
I believe most (if not all) non-barebone CPUs that come with a HSF will have the thermal grease on them. However, depending on if you are an overclocker or not, the thermal grease isn't exactly the best, but it will do.
P4 2.0 GHz Socket 478 CPU SL5YR +Fan/Heat-Sink 30 Day Warranty 2.0GHz/512/400, Adaptec Heat Sink Heatsink CPU Cool Fan For AMD Socket A Duron Athlon XP Sempron, IBM Lenovo L512 CPU Heat Sink and Cooling Fan 60Y5020 60Y5019 3LGC9TALV tested, Lenovo Thinkpad T410 T410i CPU FAN + HEAT SINK P/N : 45N5685 FRU 45M2721 tested, AMD ASUS CPU Cooling Fan Cooler Heat Sink AMD Athlon 64 X2AM2, HP ProBook 4520S Series Laptop Intel CPU Fan/Heat Sink 607132-001 Genuine, Desktop CPU Cooling Cooler Fan Heat Sink 60mmx60mm 12V, Intel P4-478 CPU Cooler-Heat Sink Delta Fan AFB0712VHD, Intel OEM Heat Sink and fan assembly for i7-9XX Quad Core CPU's, Lenovo ThinkPad T400 CPU Heat Sink & Cooling Fan 45N6141, Desktop CPU Cooling Cooler Fan Heat Sink 60mmx60mm 12V, ACCELER TECH DUAL AMD OPTERON CPU 0SA240CEP5AU MOTHERBOARD FAN HEAT SINK., Intel P4-478 CPU Cooler-Heat Sink Delta Fan AFB0712HHD, Little Vacuum / Blower Cleans CPU heat-sink, Case Fan, Power Supply & Keyboard, Dell XPS 700, 710 & 720 CPU Heatsink & Fan Shroud Assembly - TJ258 (heat sink), Dell Inspiron 1501 CPU Cooling Fan DQ5D577D026 w/heat sink OUW523, 1U AMD Copper Heat Sink & BB Fan by Dynatron. for K8, 940, 939, 754 CPUs, Toshiba Satellite L355D-S7901 Motherboard TESTED {With Heat Sink, Fan, and CPU), SONY VPCEH15FX CPU Cooling Fan with Heat Sink , Dell Alienware M11XR2 CPU Heat sink with Fan P/N HRN0P 0HRN0P, Zalman CNPS9700LED heat sink and fan LGA 775 for ASUS INTEL motherboards no cpu, Intel Core i7-2600K CPU LGA1155 Full packing with Heat Sink Fan, Hp 381865-001 Business Desktop Dc7600 P4 Cpu Heat Sink & Fan Assy., Dell Optiplex 790 Desktop CPU Heat Sink FGW90 with 4-Pin Fan K6YMY, VIO 1.5g Thermal Grease CPU Heat Sink Compound FREE S/H, Desktop CPU Cooling Cooler Fan Heat Sink 60mmx60mm 12V, Dell XPS M1330 Genuine CPU Cooling Fan Heat Sink , Gateway HACA-0001 CPU Sock-A/370 Heat Sink & Fan Up To 1.3GHz, Cooler Master Dual Fan CPU Cooler Hyper N520 Heat Sink LGA 775 / 1156 / 1366, Adaptec Heat Sink Heatsink CPU Cool Fan For AMD Socket A Duron Athlon XP Sempron, GENUINE HP dv6000 AMD CPU Cooling Fan/Heat Sink 431448-001 TESTED, ThinkPad T61 6465-CTO Motherboard Frame CPU T8100 FAN Heating Sink 15.4'' TESTED, New Titan Fenrir CPU heat sink and fan cooler AMD Intel lowest price, Intel CPU Fan & Heat Sink, HP Pavilion dv6000 CPU Heat sink and Fan 451860-001, BTX Chassis & CPU Cooling System / Cooler. BTX Heat Sink & Fan. PWM Technology, Socket 7/370 CPU cooler heat sink & fan. APSK0138, Toshiba A215-S7422 CPU Fan with Cooling Heat Sink Screws, Pccooler Blade Point S85 intel CPU Heat Sink HTPC Ultrathin Fan Cooling Cooler, Laptop CPU Fan WITH HEAT SINK Dell Inspiron 2600 Auras AT88313U000 dp/n 02n1, HP Mini 110 CPU Cooling Fan Heatsink Heat Sink 608772-001, Compaq CQ-61 CPU Heat Sink and Fan HP P/N: 582139-001, CPU Heat Sink Cooling Fan 478 Pin Retainer for Intel P4, HP Mini 210 CPU Cooling Fan Heatsink Heat Sink 622330-001, Dynatron P37G 1U LGA775 Copper Heatsink / 775 cpu heat sink cooler blower fan, Adaptec Heat Sink Heatsink CPU Cool Fan For AMD Socket A Duron Athlon XP Sempron, Toshiba Satellite A75 Fans, Heat Sinks, and CPU's, IBM Lenovo ThinkPad T40 T41 T42 T42p Long Heat Sink CPU Fan 13N5442 Tested Good, HP dv2000 AMD CPU heat sink cooling fan 455843-001, Desktop CPU Cooling Cooler Fan Heat Sink 60mmx60mm 12V,