AMD Radeon R9 280 och 280X ersätts av Tonga i augusti

Förlåt, men jag kan inte låta bli att hugga på den kroken...

Vad spelar det för roll om arbetstemperaturen är 25c eller 95c? Det är ju förmågan att överföra värme från kylaren som är det intressanta och på samma kylare med samma luftflöde är den förmågan betydligt högre vid 95c! Det Vill Säga, fläkten på ett grafikkort behöver snurra mycket långsammare (och tystare) för att hålla 95c än 25c vid samma last.

Kislet klarar höga temperaturer men det är kopparen i transistorerna som påverkas mest när resistansen i materialen ökar pga värme.

När temperaturen på ett material ökar ökar också resistansen i materialet. Det är därför folk som överklockar upplever artifacts efter en viss temperatur gräns.
Kretsen kräver mer och mer spänning för att hålla sig stabil ju varmare den blir eftersom resistansen i materialet ökar.

Temperature Effects

How Temperature Affects Resistance.

The value of a resistor changes with changing temperature, but this is not as we might expect, mainly due to a change in the dimensions of the component as it expands or contracts. It is due mainly to a change in the resistivity of the material caused by the changing activity of the atoms that make up the resistor.
Materials which are classed as CONDUCTORS tend to INCREASE their resistivity with an increase in temperature. INSULATORS however are liable to DECREASE their resistivity with an increase in temperature. Materials used for practical insulators (glass, plastic etc) only exhibit a marked drop in their resistivity at very high temperatures. They remain good insulators over all temperatures they are likely to encounter in use.

The reasons for these changes in resistivity can be explained by considering the flow of current through the material. The flow of current is actually the movement of electrons from one atom to another under the influence of an electric field. Electrons are very small negatively charged particles and will be repelled by a negative electric charge and attracted by a positive electric charge. Therefore if an electric potential is applied across a conductor (positive at one end, negative at the other) electrons will "migrate" from atom to atom towards the positive terminal.

Only some electrons are free to migrate however. Others within each atom are held so tightly to their particular atom that even an electric field will not dislodge them. The current flowing in the material is therefore due to the movement of "free electrons" and the number of free electrons within any material compared with those tightly bound to their atoms is what governs whether a material is a good conductor (many free electrons) or a good insulator (hardly any free electrons).

The effect of heat on the atomic structure of a material is to make the atoms vibrate, and the higher the temperature the more violently the atoms vibrate.
In a conductor, which already has a large number of free electrons flowing through it, the vibration of the atoms causes many collisions between the free electrons and the captive electrons. Each collision uses up some energy from the free electron and is the basic cause of resistance. The more the atoms jostle around in the material the more collisions are caused and hence the greater the resistance to current flow.
In an insulator however, there is a slightly different situation. There are so few free electrons that hardly any current can flow. Almost all the electrons are tightly bound within their particular atom. Heating an insulating material vibrates the atoms, and if we heated sufficiently the atoms vibrate violently enough to actually shake some of their captive electrons free, creating free electrons to become carriers of current.

Therefore at high temperatures the resistance of an insulator can fall, and in some insulating materials, quite dramatically.

In a material where the RESISTANCE INCREASES WITH TEMPERATURE it is said that the material has a POSITIVE TEMPERATURE COEFFICIENT.

When RESISTANCE FALLS WITH AN INCREASE IN TEMPERATURE the material is said to have a NEGATIVE TEMPERATURE COEFFICIENT.
In general, CONDUCTORS HAVE A POSITIVE TEMPERATURE COEFFICIENT
Whilst (at high temperatures) INSULATORS HAVE A NEGATIVE TEMPERATURE COEFFICIENT.
Different materials within either group have different temperature coefficients. Materials chosen for the construction of resistors therefore are most likely to be carefully selected CONDUCTORS that have a very low POSITIVE TEMPERATURE COEFFICIENT. In use, resistors made from such materials will have only very slight increases in resistivity, and therefore resistance, as temperature rises.

Det är därför en överklockning kan verka stabil i några minuter tills kortet passerar en viss gräns.
Detta fenomen märks extra tydligt när folk byter från luft till vattenkylning.
Med en temperatur minskning från 80-95c ner till 40-55c är helt plötsligt en gammal ostabil överklockning på luft helt stabil under vattenkylning.

Hörde mig snabbt för med min vän occamrazor på Overclock.net
Här är en bit ur en artikel han skrivit. Där förklarar han exakt vad som händer när temperaturerna stiger.

OccamRazor sent you this private message onOverclock.net, July 2, 3:31 am

Read a quote from my article:

"...Voltage is just is the electrical potential for a circuit to do work, Current is the flow of electric charge and wattage is the rate at which energy is transferred by an electrical circuit. Typically wattage is measured by multiplying Amperage by Voltage!  (“I” is the variable for current, or amperage, in electronics and physics. It stands for “Impetus”.) 
When you set a higher power limit, you are allowing for more amperage to be drawn, but it doesnt mean ITS drawing that amperage as its just a upper limit you set with the slider!
It depends on the load the card has from the software its running! The more harsher it is the more power it draws, voltage only will allow more amperage to flow.
Conductor materials tend to increase their resistivity with an increase in temperature!

The reasons for these changes in resistivity can be explained by considering the flow of current through the material. The flow of current is actually the movement of electrons from one atom to another under the influence of an electric field. Electrons are very small negatively charged particles and will be repelled by a negative electric charge and attracted by a positive electric charge. Therefore if an electric potential is applied across a conductor (positive at one end, negative at the other) electrons will "migrate" from atom to atom towards the positive terminal.
Only some electrons are free to migrate however. Others within each atom are held so tightly to their particular atom that even an electric field will not dislodge them. The current flowing in the material is therefore due to the movement of "free electrons" and the number of free electrons within any material compared with those tightly bound to their atoms is what governs whether a material is a good conductor (many free electrons) or a good insulator (hardly any free electrons).

The effect of heat on the atomic structure of a material is to make the atoms vibrate, and the higher the temperature the more violently the atoms vibrate.
In a conductor, which already has a large number of free electrons flowing through it, the vibration of the atoms causes many collisions between the free electrons and the captive electrons. Each collision uses up some energy from the free electron and is the basic cause of resistance. The more the atoms jostle around in the material the more collisions are caused and hence the greater the resistance to current flow.

So to sum it up, we want lower temperatures which lead to lower electrical resistance, hence having less heat produced as waste and more power to our Titans/780´s cores to OC higher!"

Take care tobias and feel free to "bother" me more often!