Thread: CPU Buyer's Guide 2.0

This is a very early version; this will be efficient when I have time. Veto promises for a timeline, though.

1.0 Dictionary of CPU Terms

1.0.....Terms

Bellow is the definitions of some of the terms, in alphabetically arrange, that which will be used in this lead,

AGP: accelerate Graphics Port. An obsolete video card slot. Do not buy a motherboard with an AGP slot. If you have an AGP slot, only acquire a fresh video card if you are completely awake that you will be paying a 50% premium for it and will likely endure a bottleneck. It is approximately surely not worth putting money into an AGP motherboard.

Benchmark: A trial of tests to resolve how well a CPU performs for comparative purpose. Benchmarks may use also actual application.

BIOS: Basic Input Output System. The fundemental firm wares which organize hardware funtions of a CPU. The blue screen available on startup to modify hardware settings, such as boot preference and clocks.

Cache: committed memory actually included into a CPU die. Like RAM, this memory is used to speed working by holding serious orders, data and memory address within the CPU itself, where it can be accessed with minimal latency. Cache is not straight similar between archetectures, but the more the better.

Chipset: The motherboard structure which regulates statement of records flow between the hard disk, RAM and CPU etc. Consists of a "North Bridge" and "South Bridge"

Clock speed, It is also known as frequency. The amount of cycle per second the CPU can perform. CPU presentation nearly instantly scales with clockspeed, but is not similar between architectures. IE, 3.6ghz Core i7 is 50% caster than 2.8ghz Core i7, 3.6ghz Phenom II is 50% faster than 2.8ghz Phenom II, 2.8ghz Core i7 is slightly faster than 3.6ghz Phenom II.
Unit=Hertz (Hz)

1 Hz = 1 cycle per second
1 KiloHertz = 1000 cycles per second
1MegaHertz = 1 million cycles per second
1GigaHertz = 1 billion cycles per second

Core: The actual processing unit

Core Count: The amount of processing units (cores) on the die.

CPU: The complete ‘package’ of die, Heat Spreader, contacts, interconnect and PCB. Apparatus are assembling eternally and cannot be changed.CPU means Central Processing Unit.

Die: The semi conductor containing the core(s)

DTPC: DeskTop Personal Computer.

Erratum: Plural = Errata. A rectification is an error(s). In the case of CPUs errata (fix) indicate an error exists. ALL present production CPUs contain flaws and errata. Generally, a flaw can address by Operating System, of BIOS .Major flaws are regularly fixed in subsequent steppings. The only erratum buyers should be very worried about is the TLB Bug in early releases of the Phenom processor.

Firmware: BIOS, working in instruction of other programs, usually used to control specific hardware devives. Frequently store on the device itself, in flash memory.

HSF: The CPU cooler congress. It can be together store, the system that ships with the CPU, or an aftermarket system, an advance to allow quieter operation or overclocking. HSF means Heat Sink, Fan.

IMC: Imbedded Memory Controller. A memory controller which is actually integrated into the die of the CPU. At present, we are used in all AMD processors, and the Core i5 and i7 series of Intel processors. Much, much more efficient than the off-die system used in the Core 2, Celeron and Pentium processors.

IPC: The amount of 'instructions' completed (retired) per clock cycle. An obsolete term, still referenced to show that additional one command is being execute per CPU cycle and compare the efficiency of processors. See SIMD. IPC means Instructions per Clock cycle.

Latency: The moment in time delay between an apply for for data and the data's 'delivery'. RAM and cache with lower latency is better.

LGA: A type of boundary (contacts) utilized for socket 775 NAD 1066. LGA means Land Grid Array.

Lithographic Node: Commonly refered to as "node". The die width the CPU is artificial. Present nodes are 90nm (nano meter), 65nm and 45nm. Smaller nodes agree to use for better presentation and competence; yet, they don't honestly influence on performance, only heat produced. Smaller nodes often allow more OC headroom, however. "Die shrink" refers to the process of moving to a smaller node.

Memory:

-RAM: Random Access Memory. Volatile memory (volatile = stored memory dumps when powered off) used (in PCs) to temporarily store data for fast access.

RAM can be currently purchased as DDR2 or DDR3 RAM. DDR3 performs slightly better, but is slightly more expensive. Motherboards can only accept one of DDR2 or DDR3 RAM. AM3, LGA-1366 and LGA-1156 use DDR3, AM2 and AM2+ use DDR2, and LGA-775 uses one or the other. It is recommended to build a new system using DDR3, but to be concerned about DDR2, it is still plenty fast.

-ROM: Read Only Memory. Fixed, non volitile memory which cannot be altered

-EPROM: Electrically Programable Read Only Memory. Rom memory which can be programed by the user. The type of memory employed by BIOS, and other hardware components for firmware.

-EEPROM:Same as EPROM
-Flash: Same as EPROM
-HDD: Hard Disk Drive. Used to store large amounts of data long term. Much slower than RAM, data needed by a specific prgram will be copied from the HDD to RAM for faster access.

Multi core: A CPU whose die has more than one processing unit (core)

Multithreading: A program or 'application' designed to use more than one core

Multitasking: operate many programs or applications simultainiuosly

NorthBridge: That "chip" of the chipset which control information run between the the face surface Bus, Memory Bus, southbridge, and video (either AGP or PCIe(16)) bus

NOTE: diverse generation of chipsets swap handing of the PCIe(non video) between the north and south bridges. The Core i5 processor has it's PCI-E controller integrated.

OEM: Original Equipment Manufacturer. A "white box" processor, identical to the retail version, but comes in plain packaging, without a HSF, and usually has a shorter (1 year) warrenty,

Overclocking: The perform of taking a CPU and adjust the performance setting, either through the software to boost the frequency on top of the industrial unit rated speed to increase performance…..’free performance’

PCI: Peripheral Component Interconnect. A development module boundary used for modems, sound cards, etc.

PCI e: An updated account of the PCI growth of a part boundary. Currently there are 2 prevalent forms. PCIe (16) used primarily for video cards (replacing AGP) and PCIe (1) which is slowly replacing the standard PCI interface. PCIe means Peripheral Component Interconnect Express.

Pins: A kind of boundary (contacts) used for socket A, 939, AM2, AM2+

Retail Box: Also refered to as Retail Box Processor and "retail". Typically more luxurious than the OEM SKU, other than by and large come through a factory HSF and 3 year manufacture warrenty.

SSE 2, 3, 4: Streaming SIMD Extensions. See SIMD

SIMD. A method of conditioning data simultainiuosly. wherever the same fuction is to be perform to many data sets, SIMD (via SSE) allows all of those data sets to be conditioned in simultaneously (parallel) vs. in series (one at a time) greatly reducing the time for a CPU to perform functions. SIMD means Single Instruction, Multiple Data

Socket: The physical boundary among the motherboard and the CPU

South Bridge: That "chip" of the chipset which regulate the flow of data to and from the hard drives, PCI development cards, onboard audio (if equipped) USB portals, LAN cards etc.

NOTE: Different generations of chipsets swap handing of the PCIe (non video) between the north and south bridges

Stepping: The review amount of a CPU. The primary quality indicates main changes, the second quality indcates slight changes. For example, a B2 stepping indicates the second minor revision of the second major revision. A B3 stepping indicates the third minor revision of the second major revision.

Value: Value is usually accepted as being the value of performance relation of a CPU

Virtualization: This is a basic meaning, as virtualization is purpose of dependant. Virtualization is a practice of simulating different hardware than really present in a system. For example, a on its own quadcore scheme used in such a way that it emulate many singlecore systems. This is an issue with server processors, and is required to run Windows 7's XP Mode.

Software consideration.

Before you can settle on which kind of processor is most excellent for you, you have to know what it is you are going to use it for. A small example of uses are:

Web Browsing,
Email
Word processing
Gaming
Graphics rendering
Video editing
Ripping (converting CD tracks to MP3 files, DVDs to MPEG2/4, AVI etc)
Compiling
Compressing

How can you use your CPU for depends on which software you have install. Not all software is formed similarly, nor does all software ‘load’ the processor equally. It is proper that software or ‘programs’ will run faster on a ‘faster’ CPU, but at some point, the processor may top of the demands of the software.

Such as,web browsing as well as Email don’t put serious demands on a CPU, and if that’s all you intend to do, there is small point in costs above $1000 on a top of the line quad core processor. A $60 dual-core CPU will be plenty, and your money would be better spent on memory (RAM) and a high speed internet connection rather than a faster processor. Conversely, if you are planning on editing video, the faster the processor the better.

Multitasking:

What its it? Multitasking is just operating many application (software programs) simultaneously

Do you multi task? If you run any modern OS (operating system), then you are previously multi tasking. Your operating system is operation numerous application and organizing them simultaneously, "behind the scenes". Windows XP (both Pro and Home), Windows Vista, and Windows 7 direct the application automatically and assign an 'affinity' (preference for a core) when the system uses a multicore processor. Affinity can be manually assigned by the user, but is best left to the OS. Running a multicore processor will not automatically improve performance in multi tasking. If the tasks you are executing are light, such as MS Solitaire, Word, and a web browser, then you will see no improvement. Heavier tasking on the other hand, which pushes the cores to their limits, will see benefits from a multicore processor. As such, this plays an important role in which processor is best for you.

WindowsVista, and to a smaller level, WindowsXP and Windows7 are relatively CPU intensive. Antivirus, bloatware, etc will all hold up CPU moment. As dual-cores are so cheap in this day and age, single-core processors have become unrecommendable in any value part. With a dual-core, even in single threaded applications, one core can handle all of the 'background' tasks, leaving the other core to run you game, play your movie, or compress you file all on it's own. Quadcores are still hugely underutilized.

One additional thing to believe about software when decide which computer to purchase is multithreading. Nowadays, the majority of new desk top CPUs obtainable multicore means they have more than one core, or processor, on the die. Morescores can pick up processing speed; however, the vast majority of software currently accessible is single thread….meaning it can only run on one core. As such, with most software, more cores will not offer a significant advantage.

Present are 3 essential type of software multi-threading: Course, Fine and Hybrid

Course multithreading are an example where a agenda is specially printed to use multiple cores. It is the most efficient type of multithreading, but it is also the mainly tricky and time consuming to write. It is also the most limited in terms of core scaling. If you have a program written for 2 cores, going from a dual core CPU to a quad core CPU will not provide an appreciable increase in performance. It will add some small increase, as backround applications can be run on a third core, but even though you have doubled the cores, it will not ‘double’ the performance. Conversely, if you are using course threaded software optimized for 4 cores, running it on a dual core will limit the speed of the program to ½ its maximum potential.

Some where a dull procedure occurs within an agenda, which does not have to call for data during the process, the loop can be assigned to its own core. Especially well multithreading is multi threading that use loops. The number of cores this type of multi threading can use is limited by the number of independent loops within the software, so this software will scale relative to the number of cores better than course multi threading, but it is not as efficient as course multithreading.