Can't use with processor intel P4 1,8 ghz and 2,6 ghz why?

you posted a statement of fact not a question.
it will support
not
will it support(a real question)

well NO
and NO PC stated, only mobo.(lost the PC ?)
nor that this PC was mobo bought in India?
YOUR mobo is core2, not core(tm) processor
they are not even the same class nor socket
no
here is the list of core i3 (all are LGA
your mobo is core2. (older )
all are over 1000 pins, LGA1156 (gen 0)

you can not stuff 10 pounds(or kg) of mud in 1 pound sack.
no can do.

That motherboard uses the CPU Socket 1155 LGA. Pretty much any processor for that socket should work. (Source: http://browser.primatelabs.com/geekbench2/1112660)

Popular CPUs for this board are:

1. Intel Core i5-3570
2. Intel Core i7-377
   

(Source: http://openbenchmarking.org/linux/motherboard/HP/HP%203396)

The motherboard for the dc7600 has an Intel LGA775 processor socket. However, not all LGA775 processors are compatible with the motherboard. For the small form factor, the following CPUs are supported: Intel Celeron D Processors:
Intel Celeron D 331 Processor (2.66-GHz, 256K L2 cache, 533-MHz FSB) , Intel Celeron D 336 Processor (2.80-GHz, 256K L2 cache, 533-MHz FSB) , Intel Celeron D 346 Processor (3.06-GHz, 256K L2 cache, 533-MHz FSB)
Intel Pentium 4 Processors with HT Technology:
Intel Pentium 4 521 Processor (2.8-GHz, 1-MB L2 cache, 800-MHz FSB) , Intel Pentium 4 524 Processor (3.06-GHz, 1-MB L2 cache, 533-MHz FSB) , Intel Pentium 4 541 Processor (3.2-GHz, 1-MB L2 cache, 800-MHz FSB), Intel Pentium 4 620 Processor (2.8-GHz, 2-MB L2 cache, 800-MHz FSB), Intel Pentium 4 630 Processor (3.0-GHz, 2-MB L2 cache, 800-MHz FSB), Intel Pentium 4 631 Processor (3.0-GHz, 2-MB L2 cache, 800-MHz FSB), Intel Pentium 4 640 Processor (3.2-GHz, 2-MB L2 cache, 800-MHz FSB), Intel Pentium 4 641 Processor (3.2-GHz, 2-MB L2 cache, 800-MHz FSB), Intel Pentium 4 650 Processor (3.4-GHz, 2-MB L2 cache, 800-MHz FSB), Intel Pentium 4 651 Processor (3.4-GHz, 2-MB L2 cache, 800-MHz FSB), Intel Pentium 4 661 Processor (3.6-GHz, 2-MB L2 cache, 800-MHz FSB) or
Intel Pentium D Dual Core Processors:
Intel Pentium D 805 Dual Core Processor (2.66-GHz, 2x1MB L2 cache, 533-MHz FSB), Intel Pentium D 820 Dual Core Processor (2.8-GHz, 2x1MB L2 cache, 800-MHz FSB), Intel Pentium D 915 Dual Core Processor (2.8-GHz, 2x2MB L2 cache, 800-MHz FSB), Intel Pentium D 925 Dual Core Processor (3.0-GHz, 2x2MB L2 cache, 800-MHz FSB), Intel Pentium D 930 Dual Core Processor (3.0-GHz, 2x2MB L2 cache, 800-MHz FSB), Intel Pentium D 940 Dual Core Processor (3.2-GHz, 2x2MB L2 cache, 800-MHz FSB), Intel Pentium D 945 Dual Core Processor (3.4-GHz, 2x2MB L2 cache, 800-MHz FSB), Intel Pentium D 950 Dual Core Processor (3.4-GHz, 2x2MB L2 cache, 800 MHz FSB)

Unfortunately, these are old processors and I don't see any available new. Newegg.com lists a couple available as refurbished. You may be better off getting a new computer with either a Intel I3 or current AMD processor.

I wish that I had better news for you.

Cindy Wells
(do not attempt to use a CPU that your motherboard doesn't support. It probably won't boot.)

The socket type of ACER G45T/G43T - AM3 V1.1 motherboard is LGA 775. Here are the compatible processors you can use for this motherboard :
Intel Pentium 4 (2.60 - 3.80 GHz)
Intel Celeron D (2.53 - 3.60 GHz )
Intel Pentium 4 Extreme Edition
(3.20 - 3.73 GHz)
Intel Pentium D (2.66 - 3.60 GHz)
Pentium Extreme Edition
(3.20 - 3.73 GHz)
Pentium Dual-Core (1.40 - 3.33 GHz)
Intel Core 2 Duo (1.60 - 3.33 GHz)
Intel Core 2 Extreme (2.66 - 3.20 GHz)
Intel Core 2 Quad (2.33 - 3.00 GHz)
Intel Xeon (1.86-3.40 GHz)
Intel Celeron (1.60 - 2.40 GHz)

Type of RAM supported has nothing to do with the processor make & type in most cases. It is more important to verify that the motherboard supports this kind of RAM.
In general, most motherboards supporting the Intel Pentium 4 2.0 GHz processor support also DDR1 RAM.

The Acer Aspire L320 can take 3 different processors

1. Intel Core 2 Duo

Dual Core chip with speeds from 1.8Ghz to 3.3 Ghz

2. Intel Celeron D

Dual Core chip with speeds from 1.6Ghz to 2.7Ghz

3. Intel Pentium 4

Single core chip with speeds from 1.3Ghz to 3.8Ghz

The Core 2 Duo 3.3 Ghz is the most expensive and Pentium 4 1.3 Ghz the cheapest.

Some more information is available on the Intel website, links are below:

http://www.intel.com/products/processor/core2duo/mobile/index.htm
http://www.intel.com/products/processor/pentium_dual-core/specs.htm


Hope this helps. Thanks for using Fixya.

I suggest this to you.
Intel Xeon Processor, 1.4 GHz/100.0K
Intel Xeon Processor, 1.5 GHz/100.0K
Intel Xeon Processor, 1.7 GHz/100.0K
Intel Xeon Processor, 2.0 GHz/100.0K, L3
Intel Xeon Processor, 2.2 GHz
Intel Xeon Processor, 2.6 GHz/400
Processor, 1.8 GHz, 603FCPGA
Processor, 2.0 GHz, 603FCPGA
Processor, 2.2 GHz, 603FCPGA
Processor, PRST, 2.4 GHz/400, INT 261668-004 284645-001 source: ftp://ftp.compaq.com/pub/supportinformation/technotes/evo_w6000_workstation_rev6_us.pdf

Depends on the socket type.. Socket 423 and 478 do not support core duo or quad core processor types. However, if you have LGA 775 (aka socket T) your motherboard will support the following:
Intel Pentium 4 (2.60 - 3.80 GHz)
Intel Celeron D (2.53 - 3.60 GHz )
Intel Pentium 4 Extreme Edition (3.20 - 3.73 GHz)
Intel Pentium D (2.66 - 3.60 GHz)
Pentium Extreme Edition (3.20 - 3.73 GHz)
Pentium Dual-Core (1.40 - 3.33 GHz)
Intel Core 2 Duo (1.60 - 3.33 GHz)
Intel Core 2 Extreme (2.66 - 3.20 GHz)
Intel Core 2 Quad (2.33 - 3.00 GHz)
Intel Xeon (1.86-3.40 GHz)
Intel Celeron (1.60 - 2.40 GHz)

Hello,
The Intel® Desktop Board D845GVAD2 supports a single Pentium® 4 processor with a system bus frequency of 400 MHz or 533 MHz, or a single Celeron® processor with a system bus frequency of 400 MHz.

So you can install upto 3.06 GHz 533 MHz(cache memory) processor and also update the ram 2 GB 400 mhz.
Dont install Prescott processor.
Hope it will help you.

You can also use any other intel 775 socket processor as well. The dual cores are at the top of the list for performance that are compatible with that board, but if you're looking for a cheaper solution, I have that board with a 3GHz pentium 4 and it runs great. Here's a list of all the processors you can use.
Intel Pentium 4 (2.66 - 3.80 GHz)
Intel Celeron D (2.53 - 3.60 GHz )
Intel Pentium 4 Extreme Edition
(3.20 - 3.73 GHz)
Intel Pentium D (2.66 - 3.60 GHz)
Intel Pentium Extreme Edition
(3.20 - 3.73 GHz)
Pentium Dual-Core (1.40 - 2.80 GHz)
Intel Core 2 Duo (1.60 - 3.33 GHz)
Intel Core 2 Extreme (2.66 - 3.20 GHz)
Intel Core 2 Quad (2.33 - 3.00 GHz)
Intel Xeon (1.86-3.40 GHz)
Intel 'Core' Celeron (1.60 - 2.40 GHz)