nine days later, AMD said that "GPZ Variant 2 ... is applicable to AMD processors" and defined upcoming steps to mitigate the threat. Several sources took AMD's news of the vulnerability to GPZ variant 2 as a change from AMD's prior claim, though AMD maintained that their position had not changed. Researchers have indicated that the Spectre vulnerability can possibly affect some Intel, AMD, and ARM processors. Specifically, processors with speculative execution are affected with these vulnerabilities. ARM has reported that the majority of their processors are not vulnerable, and published a list of the specific processors that are affected by the Spectre vulnerability: Cortex-R7, Cortex-R8, Cortex-A8, Cortex-A9, Cortex-A15, Cortex-A17, Cortex-A57, Cortex-A72, Cortex-A73 and ARM Cortex-A75 cores. Other manufacturers' custom CPU cores implementing the ARM instruction set, such as those found in newer members of the Apple A series processors, have also been reported to be vulnerable. In general, higher-performance CPUs tend to have intensive speculative execution, making them vulnerable to Spectre. Spectre has the potential of having a greater impact on cloud providers than Meltdown. Whereas Meltdown allows unauthorized applications to read from privileged memory to obtain sensitive data from processes running on the same cloud server, Spectre can allow malicious programs to induce a hypervisor to transmit the data to a guest system running on top of it. Mitigation Since Spectre represents a whole class of attacks, most likely, there cannot be a single patch for it. While work is already being done to address special cases of the vulnerability, the original website devoted to Spectre and Meltdown states: "As [Spectre] is not easy to fix, it will haunt us for a long time." At the same time, according to Dell: "No 'real-world' exploits of these vulnerabilities [i.e., Meltdown and Spectre] have been reported to date [7 February 2018], though researchers have produced proof-of-concepts." Several procedures to help protect home computers and related devices from the vulnerability have been published. Spectre patches have been reported to significantly slow down performance, especially on older computers; on the newer eighth-generation Core platforms, benchmark performance drops of 2–14 percent have been measured. On 18 January 2018, unwanted reboots, even for newer Intel chips, due to Meltdown and Spectre patches, were reported. It has been suggested that the cost of mitigation can be alleviated by processors which feature selective translation lookaside buffer (TLB) flushing, a feature which is called process-context identifier (PCID)