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Answer:
Overview - Video memory
Shared Video Memory: Using part of main memory (RAM) for the display circuit's frame buffers, which temporarily hold the rendered content being sent to the screen. Shared memory is used in PCs that have the display circuit built into the motherboard rather than housed on a separate, more costly display adapter card.
Sharing main memory with the display function reduces the amount of memory available to applications, and main memory is not as fast as the specialized video memory on stand-alone cards.
On lower end systems, the video is integrated into the motherboard. The video controller uses a certain amount of 'shared RAM' for video memory. The shared ram is taken away from main system RAM. Thus, on a 512 Mb system, if the integrated controller uses '128 Mb shared video RAM', the main system only uses 384 Mb of RAM, and this is the number you'll see when checking for the memory.
When you go out to purchase a computer, some models specify that they have a certain amount of megabytes of memory, and they may have a video card that supports a certain amount of shared memory. This means that when the video card is in use, especially in higher display modes, it will take some of the memory normally dedicated to other computing activities and use it as its own. Thus, if you buy a computer with 512 Mb of memory and 128 Mb of shared memory and you frequently use a high display settings, you may actually only have 384 Mb of physical memory available left to your computer. In some advance systems, the use of Shared video memory can be changed dynamically while the system is running, that is, at one time it may be using only 64 Mb of memory out of 128 Mb shared and dynamically change it as the demand increases or decreases. While this may be fine for some people, if you have more money, you may want to go with a computer that has video memory dedicated to the video card, saving your physical memory for other uses. A computer with 512 Mb that uses 128 Mb of shared video memory will have a gorgeous display but run poorly because Windows Vista only has 384 Mb to use (minimum recommended memory for vista is 512 Mb and 128 Mb of Video memory).
Dedicated memory means that the video card uses its own memory, and doesn't share or take up the memory from your RAM. Other than that the dedicated video card would be good for graphic intense application (CAD) and video editing, games and will also help in running windows vista ( with Aero - the new Vista user interface) smoothly.
The Advantage of a video chip with shared memory is that it is cheaper, it won't be horrible, but it won't play games (lack of RAM, and I wouldn't suggest it, this excludes flash games), and video editing won't be great (but that may not apply to ripping).
I would never buy a machine with shared video memory because 20% performance loss is not worth the small price savings realized.
As far youre requirement goes you dont require a high level graphics card, as you said, youll be doing some casual gaming Ill suggest get a lower to mid-range video card. Make sure you buy a card that matches your expansion slot type. 256MB of dedicated memory should be enough for you. You can find cards ranging from 128MB to 2GB of memory, depending on how much you want to spend. Nvidia GeForce 8400 GS/8500 GT or ATI Radeon HD 2600 Pro are my preference for a mid-range budget. Make sure the card has a HDMI, Display Port, or a DVI output. This would also help you future proof your system.
You should see my answer to Joans question from last week, it may help you too.
( http://forums.cnet.com/5208-10149_102-0.html?forumID=7&threadID=288637&messageID=2736738&tag=nl.e497#2736738 )
Hope this helps. Good luck with the purchase.
http://forums.cnet.com/5208-10149_102-0.html?forumID=7&threadID=291147&messageID=2750161#2750161
Submitted by: Ankit B.
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Answer:
Let's talk about video memory and video requirement ......
Sheldon: As part of this answer, see my answer to Joans question from last week!
http://forums.cnet.com/5208-10149_102-0.html?forumID=7&threadID=288637&messageID=2735071#2735071
Dedicated video memory (also called discreet video memory) is memory that is on the video card (or the equivalent circuitry on the motherboard), and that is separate and distinct (e.g. using different memory chips) from the system memory.
Shared memory is when a portion of the system memory is stolen from the system memory for use by the video chip as video memory. This memory is no longer available as system memory. So, for example [an extreme example], if you have 512 meg of system memory (e.g. one 512 meg memory module) and a video system with 128 meg of shared video memory, your available system memory would drop to 384 megabytes (which is below the 512MB minimum threshold for running Vista). Note that in modern systems, the use of Shared video memory can be changed dynamically while the system is running, so that at one moment it might only be using 32 megabytes, and a bit later, when you are doing something that demands more memory, it might dynamically increase to 128MB.
Share memory is definitely inferior to dedicated system memory, other things being equal. But, that said, modern systems have gotten so good that shared memory chipset video is good enough for MOST (not all) users. Also note that many modern video systems use a combination of some dedicated memory and also have the ability to use shared memory to further increase video memory only when needed.
Another comment, note that in todays world, the absolute MINIMUM video system that you should consider is one that has (or can have, given that shared memory can be dynamic) AT LEAST 128 Megabytes of video memory. Note that this might be a combination of some dedicated video memory plus some shared video memory.
If you are going to be running Vista, keep in mind that Aero (the new Vista user interface) has a MINIMUM video memory requirement of 128MB, and that Vista itself has a minimum SYSTEM memory requirement of 512MB (although its crazy to run Vista with less than one gigabyte, and bumping up to two gigabytes is almost always a wise thing to do).
Your requirements dont really suggest the need for a high-end video solution (again, see my comments to Joan in last weeks question), although I might want to investigate exactly what games you do play and it might change my response ... all that I have to go by for now is casual gaming and nothing hard core. All of the other stuff you mentioned is actually 2-D video, so any video solution will suffice, and because of Vista and the Aero interface, all of the video systems being offered in new computers are powerful enough to meet the needs of pretty much any casual user who is not doing serious 3D gaming or using CAD or simulation software.
[Summary of what I told Joan last week: 3D video is when the video card CREATES the image to be displayed, as happens in games and CAD software. 2D video is where all of the pixels in the displayed image are simply supplied to the card. Both digital photography and digital video are 2D ... the JPEG or TIFF or MPEG or AVI or {whatever} file actually contains the pixels to be displayed, at most (for example in DVD MPEG playback) they only have to be decoded (which is trivial for todays products), but they dont have to be CREATED by the video card. In contrast, in games and CAD software, there is a mathematical model of some 3D world or objects (with textures and lighting), but the video card itself has to take that mathematical description and use it to actually create the pixels that you see on your monitor. This is complex and demanding, and its what really separates the men from the boys, if you will. But in fact, people have a lot of misconceptions about this and when its required. The fact is that, except for serious gaming and 3D software, very few applications use 3D video graphics, and in particular, digital photography and digital video dont use them, generally (one notable exception being fancy screen transitions in digital video editing).]
Hope this helps,
Barry Watzman
http://forums.cnet.com/5208-10149_102-0.html?forumID=7&threadID=291147&messageID=2749711#2749711
Submitted by Watzman
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Answer:
Video Memory
Given you used the term discrete video memory, this refers to Dedicated graphics cards. This provides the most powerful class of Graphics Processor Units (GPUs) that interface with the motherboard by means of an expansion slot. Two types of slots are available PCI Express (PCIe) and Accelerated Graphics Port (AGP). Either card may be replaced or upgraded with relative ease. The earlier
motherboards used the Peripheral Component Interconnect (PCI) slots that are limited in bandwidth, and only used when PCIe or AGP slots are unavailable.
Integrated graphics solutions, or shared graphics solutions are graphics processors that utilize a portion of a computer's system RAM rather than dedicated graphics memory. Such solutions are less expensive to implement than dedicated graphics solutions, but at a trade-off of being less capable. As a GPU is extremely memory intensive, an integrated solution finds itself competing for the already slow system RAM with the CPU as it has no dedicated video memory.
A dedicated GPU is not necessarily removable given they may not interface with the motherboard in standard manner. Dedicated refers to the fact that the dedicated graphics cards have RAM dedicated to the card, not that most cards are removable.
In conclusion given you are interested in a later upgrade you should purchase a modern desktop computer with PCIe slot with capability to add a PCIe card with video memory of at least 512MB. This is required based upon the newest games even if casual. Older games run on 256MB. However, if you purchase the newest even casual games, they are demanding. Integrated video memory is like a rock-and-a hard place, given the processor demands more memory with increased processor requirements, thereby decreasing the video memory for games, photo editing, or watching videos online.
http://forums.cnet.com/5208-10149_102-0.html?forumID=7&threadID=291147&messageID=2750168#2750168
Submitted by stanmorganVideo
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Answer:
First off, there is no such thing as a "dumb" question.
What the memory term means.
When you have shared memory, the video "card" is integrated into the motherboard. It use the same memory as the rest of the system. The video memory used is SUBSTRACTED or removed from the main memory. This can be a big inconvenient. Another problem is that the memory bandwidth is shared between video processing and computing. You can set the amount of main RAM to be used for the video, but you need to change it from the BIOS settings. You find that kind of setup on cheap motherboards, usually with pretty limited memory expandability. It can be OK for you if all you do is surfing the internet, listen to music, do some accounting and text processing, and only do some casual gaming like solitaire and win mine. You may get some degradation with some video, especially for anything high definition.
Advantage: LOW price.
Inconvenient: Reduce available RAM, lowest end video processor, can't upgrade.
The motherboard's BIOS may NOT allow you to use a separate video card. NO PCIe nor AGP connector.
Dedicated is similar to the preceding. The motherboard contains a "video card" built-in, but functionally separated from the rest of the computing circuitry. The advantage is that isnt not shared with the rest of the system and have it's own data bus. The video processing can no longer interfere with the computing.
OK with about any video playing. Video editing may cause problems. Most games will play with acceptable performances. Upper mid range games and above will probably show jerky animation in the most intense parts.
Middle price. The "card" can't become unseated.
If you want to install a video card, you may need to get a PCI card as those boards seldom have a dedicated video card connector.
With the preceding 2 options, if there is a video processor failure, you need to change the mother board or install a dedicated video card.
Discreet is video RAM that resides on a video card. That memory is completely separate from system RAM. The video processing is also independent from the computing. Some of those video cards can have 512 Mb or even 1 Gb of video RAM!
TOP performances are possible... for a price!
The price range from low (about $70) to outrageous ($1000 and more).
Most video cards come with at least 128 Mb of video RAM. You can still get some with less, but they may not allow you to use that LCD at native resolution, and the saving, if any, will be negligible.
In your case, I'd stay well away from the shared kind. Video cards are easy to change, integrated video can't be changed.
Considering that even some "tame" video games can be very graphics intensive, and that you may discover a taste for some more intense gaming, I'd go for the dedicated video card with 256 or 512 Mb of RAM.
Photo editing don't ask much from the video card, any will do. It's a CPU/main system RAM task.
The next step, video editing, ask for as much main RAM as possible and a fast hard drive, but very little for the video RAM, any lower mid range will do.
As for the rest of the computer, look to get as much main RAM as you can. Also, a second hard drive where you put your datas would be a very good idea. That way, when you'll need to reinstall windows, all your data will be safe without the need of backing it all up.
http://forums.cnet.com/5208-10149_102-0.html?forumID=7&threadID=291147&messageID=2750131#2750131
Submitted by Alain Martel1