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davrosG5

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  • Content Count

    60
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About davrosG5

  • Title
    Member

System

  • CPU
    Intel i7-4790K
  • Motherboard
    Asus z97-ws
  • RAM
    16Gb
  • GPU
    GTX970
  • Case
    Corsair Obsidian 650d
  • Storage
    Samsung 850Pro 512Gb, WD Black 1Tb, WD Green 4Tb
  • PSU
    Corsair AX860i
  • Display(s)
    NEC Multisync PA272W
  • Cooling
    Noctua NH-U14S
  • Sound
    On-board
  • Operating System
    Windows 10Pro, 64bit

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  1. davrosG5

    Need help, anyone good at chemistry perhaps?

    Okay: 5g NaOH = 5/40 moles = 0.125 moles NaOH (in 120mL = 1.042 moles/L) 200 mL of 0.2M HNO3 = 0.2moles/L x 0.2L = 0.04 moles HNO3 You can ignore the Na+ and NO3- counter ions. H+ + OH- -> H2O The OH- is in excess so effectively 'all' of the H+ is neutralised so your final OH- concentration is 0.125 - 0.04 moles = 0.085 moles You have 0.085 moles of OH- in 320mL of water so you [OH-] = 0.085 moles/0.32L = 0.265625 moles/L pOH = -log10 (0.265625) = 0.5757 14 = pH + pOH pH = 14 - pOH = 14 - 0.5757 = 13.4243 or about 13.4
  2. davrosG5

    Need help, anyone good at chemistry perhaps?

    Both components are 'strong' so you don't have to worry about the ionisation potential of either - it would be different if you had something like acetic acid or ammonia for example. pH is the -log (to the base 10) of the Hydrogen ion concentration It's counterpart, pOH is the -log (to the base 10) of the Hydroxide ion concentration. The sum of pH and pOH is 14 so once you know the concentration of one of the ions you can work out the rest. You said you had worked out the concentrations - the acid will have been completely neutralised as the NaOH was in excess. Whatever your final NaOH concentration is also the OH concentration so you can calculate the pOH value then subtract it from 14 to get the pH. I got a pH of ~13.4.
  3. If you are in the UK then the seller is required to cover the cost of returning a faulty item: Which? Letter template
  4. Looking at the mobo manual and your photo you appear to have installed the FB-DIMM's incorrectly. The ram slots are in 4 banks and for 6 DIMM's as shown should be installed in matched pairs as follows: 1A (nearest the PCI/PCIe slots) 1B 2A 2B 3A 4A Refer to section 2-6 of the mobo manual. I used to have a MacPro with FB-DIMM's and it was incredibly sensitive to having exactly matched modules otherwise it wouldn't recognise half of them and I got the distinct impression that was just a FB-DIMM thing. It looks like you're mixing several different modules going by the colours of the heat spreaders. Have you tried with just the orange modules (which would need to be installed 1A, 2A, 3A, 4A), assuming they are all the same size and spec?
  5. Right to Repair is definitely not int he interest of the companies - it would impact their bottom line both in terms of reduced sales and also having to stock parts for an extended period of time. Companies that appear to be friendly to RTR are doing so to undermine their competitors, it's that simple. As a consumer, I'd certainly like to see greater repairability in a number of devices and/or longevity but you've got remember that companies aren't in it for consumers *whatever they may profess in public), they are in it for their owner whether that's shareholders, private equity or whatever. It's also worth remembering that computer products are increasingly comoditised and essentially designed to be disposable rather than repairable. It applies to pretty much everything from cars to domestic white goods. How user repairable do you think a Tesla car is despite its substantial cost? For example, various companies (not just Apple) have argued that consumers expect products like phones and laptops to get thinner and thinner over time and that's what they've delivered. However there is a trade-off to make things thinner - if you want interchangeable and easily accessible swappable parts it's a lot harder to thin things down. For example, a replaceable battery needs to be in a reasonably robust outer package so that it can survive being handled and installed and removed multiple times. If the battery component is sealed inside the body of the device and can't be (easily) removed or accessed it can be thinner and/or an odd shape to make better use of the available space. Moving away from phones etc, have a look at Intel's NUC products - the CPU is a soldered component - a packaged replaceable one takes up more space. You're trading off size against repairability and it's not practical to please everyone so the companies go where the biggest market is. Companies won't make things more repairable unless there is an imperative to do so. That could come from government legislation but the most effective driver would be consumer demand. If companies making super thin sealed phones and laptops start losing out to competitors selling user upgradeable ones in a big way they'll shift tack very quickly but that would require the majority of consumers, not just the highly vocal but relatively niche tech savvy folks (like on here), to do more than moan about prices and actually change what they prefer to buy. Edit: If you look at computers, it is possible to get ones that do lean more towards longevity - the ones sold to business customers by the likes of HP and Dell will often have a guaranteed 'serviceable' period where the manufacturer commits to hold stock of spares etc for s defined period of time (like a minimum of 5 years from product launch for example). But again, you have a trade-off - these systems will usually have a pretty locked down specification in the first place and/or you'll pay a higher price than you would for 'consumer' grade PC with similar specs.
  6. davrosG5

    dog thread

    Ah dog farts. My old dog Tom (also a Collie) once released a guff while lying in the middle of the livingroom. He raised his head to look at his own backside and decided that was good time to leave the room - even he didn't like his own brand (at least that time). Suffice to say the rest of the room occupants got hit with it just after he'd slinked out the room.
  7. davrosG5

    dog thread

    Dogs have owners, cats have staff. In other news, this is Glen, my parents dog: His propensity for enjoying playing with rocks has had an adverse effect on his teeth (of which he has few left), hence the sticky out tongue. The disaster that are his teeth don't seem to bother him as he really likes chewing up ice cubes. In his younger days he had a habit of periodically receiving new instructions from the mothership (he'd stop dead and start at the lights in the livingroom for a few seconds then go on about his business). Border collie in case you can't tell.
  8. IT Crowd? I usually say I prefer rugby. But I don't really watch sport much at all.
  9. davrosG5

    Surge Protection

    Do you actually mean a surge protector? A surge protector is designed to protect your appliance, whatever it is, from electrical surges from the mains electricity supply. I don't see any way this would help with the situation you described. If the fault with the washing machine was caused by a power surge it's too late - the damage has already occurred. You could get a simple timer switch so you could set it to switch off the power around the end of the washing cycle or look to have the timer device in the washing machine repaired. Alternatively, you could just replace the washing machine with a properly working one - if you do that then, assuming the original timer fault was actually caused by a power surge, getting a surge protector might be worthwhile depending on how reliable or otherwise your electrical supply is.
  10. You’ve heard of Protocase? Also, anodising is generally what you can do with aluminium (it’s increasing the thickness of the naturally occurring oxide layer, in steel you’d end up with rust).
  11. davrosG5

    Who's your favorite Muppet/Puppet?

    Beaker. For I too am a ginger scientist!
  12. davrosG5

    Upgrade Question

    I'd be surprised if the CPU was a bottleneck tbh. What sort of games and at what resolution were you planning on playing with a 2070? Given we don't actually have performance numbers for the 2070 yet it'd be worth waiting to see how it stacks up against the Pascal cards - by the time it's out you may be able to pick up a 1080 or even a 1080Ti (wild optimism ) for same sort of price so unless you're going in hard on stuff that takes advantage of the Raytracing it may not be much of a step up over the Pascal cards. It was conspicuous that nVidia weren't really making much of a thing about performance deltas where raytracing wasn't a factor.
  13. davrosG5

    Video Request: Server building basics

    The AMD equivalent for Intels Xeon is, as you say, the Epyc lineup. The main difference you will find between the higher end Xeon/Epyc cpu's and the Core/Ryzen/Threadripper lines is support for multi-socket operation - so the maximum number of physical Core/Ryzen/Threadripper chips you can have per motherboard is one but with Xeon Scaleable and Epyc its 2 or more depending on the SKU. One the CPU front, these days the server parts are often optimised more for things like virtualisation which is one reason they tend to also support higher RAM ceilings than the more consumer grade parts. Server parts will also typically offer a greater deal of PCIe connectivity than the consumer parts, for example Intels HEDT parts top out at 44 PCIe lanes, but the Xeon Scaleable allows 48 (and you can have 2 cpu's so your system supports 96 lanes). Threadripper allows 64 PCIe lanes (4 reserved for the chipset or something IIRC) whereas a dual Epyc board will give you 128 lanes. The other oft given justification for the higher price of server gear is that it's built to a higher standard in terms of longevity - servers are generally expected to operate 24/7 for extended periods of time and also in generally hotter conditions than consumer grade stuff. It'll also often be warranted to be able to run under those conditions for a longer period of time than the equivalent consumer hardware. As for storage, enterprise SSD's and HDD's are optimised for typical server workloads so have somewhat different performance characteristics than consumer gear. They may also come with SAS, rather than SATA or NVMe connectors which currently tops out at 12GB/s transfer rate compared with 6 GB/s for SATA. IN addition, they'll typically also be intended for use in much larger sized arrays than consumer NAS type drives for example - consumer NAS drives are typically recommended for anywhere up to 8 - 16 drives max int he array whereas you could have a storage server with 20+ drives (which incidentally is interesting given Seagate provided Linus with what looked like IronWolf Pro drives for his Storinator/Petabyte project IIRC) The server equivalents of things like ATX are the SSI CEB and EEB form-factors. They're similar in size to ATX but have the mounting holes in slightly different locations. You're also more likely to see proprietary shaped motherboards to fit specific chassis - you get some interesting L-shaped mobo's for some types of server for example. Server power supplies often are intended for hot-swap-capable operation - so you'd have dual PSU's in the case, either of which is capable of carrying the full load of the server. If one fails you can pull it and slot in a replacement without having to shut down the server. PSU's for rack servers tend to be long and thin rather than conforming to the more traditional PSU layout you get for consumer or even workstation computers. In summary, whether you'd really see any genuine benefit from actual server grade hardware depends entirely on what it is you want to do with the server and to an extent what case/form factor you use and where it will be located (for example is it going to be a Tower or a Rackmount case?). If you go with rackmount stuff then it's typically much louder than consumer grade hardware because it's expected to operate with more restricted airflow (so the fans need to run at higher rpm's to deliver the necessary cooling). Otherwise, building a server will be very much like building any other PC, it's just that the parts tend to be more expensive and things don't necessarily screw in/attach in the same places you'd expect in consumer PC.
  14. davrosG5

    Video Request: Server building basics

    For more server/enterprise oriented videos I'd suggest taking a look at Level1Techs. But yeah, you can technically build a server from any compatible PC parts, the 'server' is really the software OS that goes on it whether that's Linux, Windows or some other UNix variant. Server grade hardware is generally a bit harder to obtain because it's normally sold to system integrators but you might be able to pick up some stuff from the likes of SuperMicro as they make a lot of server grade hardware. Buying new, assuming you can find a supplier, will be considerably more expensive than the nearest equivalent consumer grade hardware. As EMC says above though you can find a lot of used server hardware on eBay but it'll probably be at least a generation or so behind current consumer stuff as enterprise customers tend to hold onto their hardware for a specific period of time (to achieve ROI on it). If you want an idea of server components go and have a look at the SuperMicro website - they produce everything from the chassis to the power supply, motherboards and add-in cards right up to complete systems. Whether you can find anywhere to sell to you directly is a different question though.
  15. davrosG5

    Best website with hotel bookings

    Whichever site you use it can be worth phoning the hotel directly and seeing if they'll do a better deal directly (if you deal direct they don't have to pay commission to the website). You can't haggle on a website but you can over the phone.
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