so it means in athlon 635 or x4 955 there is no integr gpu like in i5 750, but in amd, the motherboard (those mentioned above) will be able to provide gfx support eventhough no gfx card is prozided? is it that?
You got it right. The onborad/Integrated Graphics solution from AMD is better.
and that i5 combined with x58 boards rather than p55 will be able to function without gfx card, rt?
You cannot plug a Core i5 to a X58 motherboard. X58 is designed for Core i7 9XX series and they are costly. Let me clear your doubt about it.
Core i7 9XX series or Bloomfield: Need X58 chipset based motherboard. Don't have onCPU graphics. X58 motherboards even does not have any graphics core, so you need to add a discrete Gfx card. These processors are highest performing and most costly desktop processors. All processors from this family is quad core. They have 1366 pin socket. Created on 45 nm process.
Core i5 7XX and Core i7 8XX or LynnField. These processors are also quad core but requires 1156 pin socket based P55 chipset based motherboard. They are the 2nd highest performing CPU. They don't have any onDie graphics. But P55 motherboards also have Intel 4000 series graphics. Based on 45nm process
Core i5 5XX, 6XX and Core i3 Dual Core or Arrandale: These processors are based on 32 nm fabrication process. They have onCpu graphics core. Although they designed with same 1156 pin socket like LynnField, and can be plugged in a P55 motherboard, but for enabling the Graphics core in CPU, you need a separate motherboard based on called H55 chipset.
H55 motherboard does not have any graphics but the Gpu inside the Core i5 dual core processor will do the job, once plugged in . The performance of this onChip graphics is also very bad.
AMD Phenom II and Athlon II: None of the AMD processors have onchip graphics. But the graphics solution present in the AMD motherboards are far better than both p55 graphics and Core i5/i3 graphics.
Now putting any processor in any motherboard will not do any help, until they are compatible.