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Video Cables Question
My monitor has two different kind of ports:
* VGA * DVI The desktop PC has these ports: * VGA * DisplayPort Right now the monitor is connected to the PC with a VGA cable. I've seen DisplayPort-to-DVI cables for sale, but I'm not quite sure whether there would be any advantage in using such a cable instead of the VGA one. What do the experts think? -- tb |
#2
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Video Cables Question
tb wrote:
My monitor has two different kind of ports: * VGA * DVI The desktop PC has these ports: * VGA * DisplayPort Right now the monitor is connected to the PC with a VGA cable. I've seen DisplayPort-to-DVI cables for sale, but I'm not quite sure whether there would be any advantage in using such a cable instead of the VGA one. What do the experts think? DisplayPort cables exist in two types. 1) Passive (cheap) 2) Active (expensive) The necessity of each, depends on what is at each end of the cable. For example DisplayPort -- VGA (active, expensive) So what you want to do, is price cables, and see if DisplayPort to DVI is a cheap cable. Note that if it is a cheap cable, it would have DVI-D on output. The DVI-I connector has an analog (VGA) and a digital (DVI-D) section, and if there is such a thing as a cheap DisplayPort to DVI cable, it just has the digital signals on it. Which is perfectly fine. The only reason for my warning, is if you attempt to combine a DisplayPort -- DVI-D + DVI to VGA dongle there would be no signal on the VGA pins. So in general terms, it's possible for a DisplayPort to make digital signals without too much fuss. But some formats, such as VGA, an active chip inside the fat end of the cable, does a translation for you. And that costs money. And might even need a small power adapter plugged into the wall. ******* DisplayPort to DVI will look superior at the limits of resolution. Say, for example, the DisplayPort does "single link DVI", which has a 1920x1200 reduced blanking limit. Well, the picture from that would be sharp as a tack. Whereas, if you asked the VGA port on some computer, to make 1920x1200, it's not going to be nearly as nice. At lower resolutions, you would be hard pressed to tell the difference. At 1024x768, they would look the same. But as the native resolution requirement goes up (driving big-ass monitor), then the DisplayPort to DVI digital method looks better. ******* OK, so let's go shopping :-) Coboc 6 inch DisplayPort to DVI Passive Adatper $8 http://www.newegg.com/Product/Produc...82E16812119558 "Requires a Dual-mode DisplayPort(DP++) Source" So the price tells you it is a passive converter. And the technical requirement in the advertisement, tells you what to check for on the video card end. If the video card is DP++, then it can drive the eight dollar adapter for you. And provide single link DVI up to 1920x1200 @ 60Hz So before you spend $8, start researching the DisplayPort source characteristics (on your video card). Paul |
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Video Cables Question
On 7/6/2015 at 3:16:08 PM Paul wrote:
DisplayPort cables exist in two types. 1) Passive (cheap) 2) Active (expensive) The necessity of each, depends on what is at each end of the cable. For example DisplayPort -- VGA (active, expensive) So what you want to do, is price cables, and see if DisplayPort to DVI is a cheap cable. Note that if it is a cheap cable, it would have DVI-D on output. The DVI-I connector has an analog (VGA) and a digital (DVI-D) section, and if there is such a thing as a cheap DisplayPort to DVI cable, it just has the digital signals on it. Which is perfectly fine. The only reason for my warning, is if you attempt to combine a DisplayPort -- DVI-D + DVI to VGA dongle there would be no signal on the VGA pins. So in general terms, it's possible for a DisplayPort to make digital signals without too much fuss. But some formats, such as VGA, an active chip inside the fat end of the cable, does a translation for you. And that costs money. And might even need a small power adapter plugged into the wall. ******* DisplayPort to DVI will look superior at the limits of resolution. Say, for example, the DisplayPort does "single link DVI", which has a 1920x1200 reduced blanking limit. Well, the picture from that would be sharp as a tack. Whereas, if you asked the VGA port on some computer, to make 1920x1200, it's not going to be nearly as nice. At lower resolutions, you would be hard pressed to tell the difference. At 1024x768, they would look the same. But as the native resolution requirement goes up (driving big-ass monitor), then the DisplayPort to DVI digital method looks better. ******* OK, so let's go shopping :-) Coboc 6 inch DisplayPort to DVI Passive Adatper $8 http://www.newegg.com/Product/Produc...82E16812119558 "Requires a Dual-mode DisplayPort(DP++) Source" So the price tells you it is a passive converter. And the technical requirement in the advertisement, tells you what to check for on the video card end. If the video card is DP++, then it can drive the eight dollar adapter for you. And provide single link DVI up to 1920x1200 @ 60Hz So before you spend $8, start researching the DisplayPort source characteristics (on your video card). Paul Thanks Paul. The desktop is a Dell OptiPlex 9020 Mini Tower with an Intel i7-4790 processor, so the Intel HD Graphics 4600 within the i7-4790 takes care of the video signal. The desktop has no discrete video card. According to this link: http://ark.intel.com/products/80806/...ocessor-8M-Cac he-up-to-4_00-GHz, the graphics autput is DP (not DP++), and I was thinking about purchasing this cable: http://www.monoprice.com/Product?c_id=102&cp_id=10246&cs_id=1024608&p_id=60 15&seq=1&format=2. What do you think? -- tb |
#4
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Video Cables Question
tb wrote:
On 7/6/2015 at 3:16:08 PM Paul wrote: DisplayPort cables exist in two types. 1) Passive (cheap) 2) Active (expensive) The necessity of each, depends on what is at each end of the cable. For example DisplayPort -- VGA (active, expensive) So what you want to do, is price cables, and see if DisplayPort to DVI is a cheap cable. Note that if it is a cheap cable, it would have DVI-D on output. The DVI-I connector has an analog (VGA) and a digital (DVI-D) section, and if there is such a thing as a cheap DisplayPort to DVI cable, it just has the digital signals on it. Which is perfectly fine. The only reason for my warning, is if you attempt to combine a DisplayPort -- DVI-D + DVI to VGA dongle there would be no signal on the VGA pins. So in general terms, it's possible for a DisplayPort to make digital signals without too much fuss. But some formats, such as VGA, an active chip inside the fat end of the cable, does a translation for you. And that costs money. And might even need a small power adapter plugged into the wall. ******* DisplayPort to DVI will look superior at the limits of resolution. Say, for example, the DisplayPort does "single link DVI", which has a 1920x1200 reduced blanking limit. Well, the picture from that would be sharp as a tack. Whereas, if you asked the VGA port on some computer, to make 1920x1200, it's not going to be nearly as nice. At lower resolutions, you would be hard pressed to tell the difference. At 1024x768, they would look the same. But as the native resolution requirement goes up (driving big-ass monitor), then the DisplayPort to DVI digital method looks better. ******* OK, so let's go shopping :-) Coboc 6 inch DisplayPort to DVI Passive Adatper $8 http://www.newegg.com/Product/Produc...82E16812119558 "Requires a Dual-mode DisplayPort(DP++) Source" So the price tells you it is a passive converter. And the technical requirement in the advertisement, tells you what to check for on the video card end. If the video card is DP++, then it can drive the eight dollar adapter for you. And provide single link DVI up to 1920x1200 @ 60Hz So before you spend $8, start researching the DisplayPort source characteristics (on your video card). Paul Thanks Paul. The desktop is a Dell OptiPlex 9020 Mini Tower with an Intel i7-4790 processor, so the Intel HD Graphics 4600 within the i7-4790 takes care of the video signal. The desktop has no discrete video card. According to this link: http://ark.intel.com/products/80806/...ocessor-8M-Cac he-up-to-4_00-GHz, the graphics autput is DP (not DP++), and I was thinking about purchasing this cable: http://www.monoprice.com/Product?c_id=102&cp_id=10246&cs_id=1024608&p_id=60 15&seq=1&format=2. What do you think? There is a logo apparently available, for placing next to dual-mode DP connectors. https://en.wikipedia.org/wiki/DisplayPort Dual-mode Dual-mode DisplayPort (also known as DisplayPort++) can directly output single-link HDMI and DVI signals using a simple passive adapter that adjusts from the different connector and the lower voltages used by DisplayPort. When a dual-mode chipset detects that a DVI or HDMI passive adapter is attached, it switches to DVI/HDMI mode which uses the 4-lane main DisplayPort link and the AUX channel link to transmit three TMDS signals, a clock signal and Display Data Channel data/clock. Dual-mode ports are marked with the DP++ logo; most DisplayPort graphics cards support this mode. You can see the correct logo on the back of this unrelated product. https://communities.intel.com/servle...H_backside.jpg I've been trying to find confirmation on the communities.intel.com site, but so far, no matching situation has come up. And Intel has a charming FAQ page, that says whether such things are supported, could be a "BIOS issue". I was hoping there would be some info, either in DXDIAG or in an Intel control panel, about the hardware, but both are "as dumb as dirt". Nothing I could spot there would answer the question. That leaves talking to some tech support people (at Dell or at the Intel community forums), or, using the "two purchase plan". Buy the dumb cable for $8, if no output, buy an active adapter for a lot more. Active adapters can be $30 to $100. They can have single-link DVI (1920x1200 @ 60HZ reduced blanking), or they can be dual-link DVI (both sets of digital pins driven on the DVI connector) when you want higher resolutions (like for an Apple Cinema display). This is an example of a premium design. It draws power from a USB port, so no worries about power. I could spot some other, cheaper adapters, that use the power pin on DisplayPort, and for some reason, the digital display is full of colored snow. So check the reviews before buying one. http://www.newegg.com/Product/Produc...82E16815158262 I would try a local computer store, and pick up a passive cable there, and give it a try. That would save a bit on shipping, as the odds of you returning the $8 cable for a refund, you'd lose more than that on shipping. So if the DP++ logo is present, great, a passive cable will help you get 1920x1080 or 1920x1200 on DVI (single-link). If the DP++ logo is missing, try the passive cable anyway, lose $8, then face shopping for an active adapter. Paul |
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