memory – Computer fails to load with new RAM

I decided to upgrade my PC by increasing amount of RAM from 16GB (4 sticks, 4GB each) to 32GB (4 sticks, 8GB). However, after replacing RAM with new sticks, the computer failed to load. After launching it, some coolers make several rotations and the system fails to turn on. And several seconds later it makes another try but without any success. Old RAM stick work totally normally.

My motherboard specification says that such amount and type of RAM is supported (https://www.gigabyte.com/Motherboard/GA-Z68P-DS3-rev-10/sp#sp). Here’s a cite:

  • 4 x 1.5V DDR3 DIMM sockets supporting up to 32 GB of system memory
  • Dual channel memory architecture
  • Support for DDR3 2133/1866/1600/1333/1066 MHz memory modules
  • Support for non-ECC memory modules
  • Support for Extreme Memory Profile (XMP) memory modules

The store where I bought them also confirms their compatibility before I made this order.

I tried the following:

  • Reset CMOS in BIOS by extracting a small battery under the video card;
  • Insert RAM sticks in all slots one by one;
  • Change RAM sticks’ location in different DIMM slots, in different combinations;
  • Manually set the memory modules’ frequency in BIOS to 1866 MHz.

Technical info:

  • Motherboard – Gigabyte Z68P-DS3 (Socket 1155);
  • New RAM – HyperX DDR3-1866 16384MB PC3-14900 (Kit of 2×8192) FURY Black (HX318C10FBK2/16), 2 pairs;
  • Windows 10 (x64).

I’m thinking, should I return the RAM back to the store or there is a way to make it working on my PC.

Any help is highly appreciated. Thank you in advance! 🙂

computer networks – Why processes on the internet are not required to use TCP or UDP?

Here is an excerpt from Andrew S. Tanenbaum, Computer Networks, 5th edition, Chapter 5 (The Network layer), Page 455:

(Fifth, processes on the Internet are not required to use TCP or UDP. If a user on machine A decides to use some new transport protocol to talk to a user on machine B (for example, for a multimedia application), introduction of a NAT box will cause the application to fail because the NAT box will not be able to locate the TCP Source port correctly.)

My question is in this context what does processes means? Is it a process of data exchange between routers? And why processes on the internet are not required to use TCP or UDP? Isn’t it apart of IP protocol and thus it will be used on the internet?

Find the formulas of the middle point algorithm for drawing the parabola? Computer Graphics

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Pumping Lemma,regular languages – Computer Science Stack Exchange

Lets say that we have the language L = { $a^n$$b^m$$c^{m+n}$ $|$ $m$,$n$ $>=0$ }
What is the way that i should follow to prove

that the language is not regular?

  • Assume that the language is regular.
  • So,there is a string $win L$ such that $w = xyz$ , $|xy|leq n, yneqε $, n is the pumping length

Lets say that the string that i choose( w string) is $w = a^nb^mc^{m+n}$

Is this choice correct ?
Can someone explain me the best choice of $y$ ?

Should be $y = a^{n-r} $ and $x = a^n $ ? Because of $|xy|leq n$ ?

Thank you and sorry for my english.

ubuntu mate – High computer case temperature

My computer was doing an image save of my hard drive to a second hard drive. (Gparted)

I have done that many times.

But I heard some unusual sounds coming from my computer case.

So I took off one of the side panels and could feel some heat that seemed uncharacteristically high.

I put a thermometer in and it read around 100 degrees F.

After the process, the temp went to around 80 degrees.

Do I need to be concerned?

Can a computer fan send you a code?

Normally, when I turn on my cpu the fan goes to high speed for a second and normalizes. Lately, when I start my CPU the fan seems to send me a code in pulses. Similar to how some devises send an error code through a flashing light, but in this case a flashing fan; can a cpu fan send a code and are used like this? If not intentional, what would cause the fan’s sofeware to be changed or signal to the fan interrupted?

The fan sounds normal and silent as always and cpu is normal too.

active directory – Limit access to a network share to specific computer

There are certain confidential data and we want to make sure that is does not get copied by user and eventually leaked out of organisation.

For achieving the same, we have defined a restricted windows machine which a user can access but no data can be taken in or out. Users on this machine are supposed to access to those sensitive items which are not supposed to be copied.

What i am looking for is to define sub-paths of a network share, to be accessible from certain computers only. Like, if userA access folderA in the share from Workstation-1, he should get access denied, but instead if he access it from Workstation-2, he should get access.

I am using AD controlled environment, with windows Server 2016. Had look in Dynamic access control, but don’t know if its possible with it.

logic for computer scientists by Uwe Schöning

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computer architecture – In a single cycle datapath, do ‘decode’ and ‘operand fetch’ occur simultaneously?

After instruction has been fetched, does it go to control unit and register file at the same time or one after the other?
For example if the control unit and register read both have 80ps delay, and we’re calculating the total delay for a cycle, would we take their delay as 80ns(if they occur simultaneously) or if they happen one after the other so in that case delay of decode and operand fetch would be 160ns. Which one is correct?